MDL-59562 core: updated type hint of new function

MDL-59562 core: changed branch behaviour during initial install.

MDL-59562 upgrade: Plugins can declare supported moodle versions

* Plugins can now explicitly declare supported and incompatible Moodle
  versions in version.php
  - $plugin->supported[37,39];
    supported takes an array of ascending numbers, that correspond to a
    range of branch numbers of supported versions, inclusive. Moodle
    versions that are outside of this range will produce a message
    notifying at install time, but will allow for installation.

  - $plugin->incompatible = 36;
    incompatible takes a single int corresponding to the first incompatible
    branch. Any Moodle versions including and below this will be prevented
    from installing the plugin, and a message will be given when
    attempting installation.

weekly release 3.9dev

NOBUG: Fixed file access permissions

Merge branch 'install_master' of https://git.in.moodle.com/amosbot/moodle-install

Automatically generated installer lang files

Merge branch 'MDL-67599-master' of https://github.com/snake/moodle

MDL-67599 behat: fix behat tests assuming Jan 2020 is a future date

Merge branch 'MDL-65835-master' of git://github.com/abgreeve/moodle

MDL-65835 plagiarism: Initial deprecation of old functions.

This is the initial deprecation of:
* plagiarism_save_form_elements
* plagiarism_get_form_elements_module
* plagiarism_plugin::get_form_elements_module
* plagiarism_plugin::save_form_elements

Merge branch 'MDL-67598' of https://github.com/stronk7/moodle

Automatically generated installer lang files

MDL-67598 unit tests: Pass day of month without leading zero

Note this fixes the unit tests. Still the calendar API itself
should be able to manage this cases, both casting (int) or
being stricter about what's allowed there (param hinting).

But that falls out from this issue and the code that introduced
the failures, so the pure unit-test fix has been applied.

Merge branch 'MDL-67403-x-redirect-by' of https://github.com/brendanheywood/moodle

Merge branch 'MDL-67385-master' of git://github.com/rezaies/moodle

Merge branch 'MDL-67593-master' of https://github.com/snake/moodle

MDL-67593 core_iplookup: update lang string describing download process

Let users know they need to register on maxmind before granted download
access.

Merge branch 'MDL-63996-master' of git://github.com/andrewnicols/moodle

MDL-67593 core_iplookup: use MaxMind test database in unit tests

Instead of downloading a live database (now not available publicly)
use a local test database.

Merge branch 'MDL-67487-master' of git://github.com/lucaboesch/moodle

Merge branch 'MDL-67470-master' of git://github.com/junpataleta/moodle

MDL-67470 theme_boost: settings_menu_proxy correct background

the .region_main_settings_proxy was introduced in MDL-56582 using the
wrong bootstrap variable for the background color

Merge branch 'MDL-67233-master' of git://github.com/peterRd/moodle

Merge branch 'MDL-67491-master' of git://github.com/junpataleta/moodle

Merge branch 'MDL-67416' of https://github.com/stronk7/moodle

Merge branch 'MDL-67380-master' of git://github.com/aanabit/moodle

Merge branch 'MDL-63650-master' of git://github.com/aanabit/moodle

Merge branch 'master-MDL-67467' of https://github.com/yao9394/moodle

Merge branch 'MDL-67523-master' of git://github.com/marinaglancy/moodle

Merge branch 'MDL-67527-master-enfix' of git://github.com/mudrd8mz/moodle

Merge branch 'MDL-63107-master' of git://github.com/bmbrands/moodle

Merge branch 'MDL-65809-master-travisphpbump' of https://github.com/snake/moodle

MDL-65809 core: travis min php version set to 7.2 to match requirements

Merge branch 'MDL-65809-master' of git://github.com/sarjona/moodle

Merge branch 'MDL-60985-master' of git://github.com/lucaboesch/moodle

Merge branch 'MDL-66999-master' of git://github.com/bmbrands/moodle

MDL-67467 Reports: sortable date format in pregress csv report

date format in csv report should be sortable by date.

Merge branch 'master-MDL-67524' of https://github.com/yao9394/moodle

Merge branch 'MDL-67374-master' of git://github.com/rezaies/moodle

Merge branch 'MDL-59487' of https://github.com/brendanheywood/moodle

MDL-67524 book: fixing view hidden chapter issue

* Users who has permission should be able to view after turning editing off

Automatically generated installer lang files

MDL-67416 composer: bump to moodle-behat-extension 3.39.1

that version already requires php72. The lock file has been
created using that php72 version.

MDL-67491 core_message: Primary'fy the contact request counts

MDL-60985 tool_usertours: Hide next on last, prev on first and primary.

MDL-67487 forms: align "Custom" checkbox for course section name.

MDL-65809 upgrade: clean < 3.5.0 upgrade steps

This just deletes all the upgrade steps previous to 3.5.0. Some
small adjustments, like tweaking globals can also be applied
when needed.

Also includes an upgrade step to prevent upgrading from any
version < 2018051700 (v3.5.0) as anti-cheating measure.

Previous commits have removed/deprecated all the upgradelib functions
not used anymore in codebase. Deletion has been documented in corresponding
upgrade.txt files:

- upgrade_fix_block_instance_configuration()
- upgrade_theme_is_from_family(), upgrade_find_theme_location()
and linkcoursesectionsupgradescriptwasrun setting
- upgrade_block_positions
- upgrade_fix_config_auth_plugin_names()
 and upgrade_fix_config_auth_plugin_defaults()
- format_xxx_upgrade_remove_numsections(), format_xxx_upgrade_hide_extra_sections()
and format_xxx_upgrade_add_empty_sections()
- filter_mathjaxloader_upgrade_cdn_cloudflare()
and filter_mathjaxloader_upgrade_mathjaxconfig_equal()
- get_assignments_with_rescaled_null_grades()

These have been kept because continue being used by restore:

- \core\task\refresh_mod_calendar_events_task

MDL-65809 upgrade: remove get_assignments_with_rescaled_null_grades

This function was used only by deleted upgrade steps
so it's safe to proceed with straight deletion, considering
it internal. Deletion has been documented in corresponding
upgrade.txt files.

MDL-65809 upgrade: remove filter_mathjaxloader_upgrade_xxx

These functions were used only by deleted upgrade steps
so it's safe to proceed with straight deletion, considering
them internal. Deletion has been documented in corresponding
upgrade.txt files:

    - filter_mathjaxloader_upgrade_cdn_cloudflare()
    - filter_mathjaxloader_upgrade_mathjaxconfig_equal()

MDL-65809 upgrade: remove format_xxx_upgrade_remove_numsections

These functions were used only by deleted upgrade steps
so it's safe to proceed with straight deletion, considering
them internal. Deletion has been documented in corresponding
upgrade.txt files:

    - format_topics_upgrade_remove_numsections()
    - format_topics_upgrade_hide_extra_sections()
    - format_topics_upgrade_add_empty_sections()
    - format_weeks_upgrade_remove_numsections()
    - format_weeks_upgrade_hide_extra_sections()
    - format_weeks_upgrade_add_empty_sections()

MDL-65809 upgrade: remove upgrade_fix_config_auth_plugin_names

These functions were used only by deleted upgrade steps
so it's safe to proceed with straight deletion, considering
them internal. Deletion has been documented in corresponding
upgrade.txt files:

- upgrade_fix_config_auth_plugin_names()
- upgrade_fix_config_auth_plugin_defaults()

MDL-65809 upgrade: remove upgrade_block_positions

This function was used only by deleted upgrade steps
so it's safe to proceed with straight deletion, considering
it internal. Deletion has been documented in corresponding
upgrade.txt files.

MDL-65809 upgrade: remove upgrade_theme_is_from_family

These functions and setting were used only by deleted upgrade steps
so it's safe to proceed with straight deletion, considering
them internal. Deletion has been documented in corresponding
upgrade.txt files:

- upgrade_theme_is_from_family()
- upgrade_find_theme_location()
- linkcoursesectionsupgradescriptwasrun setting

MDL-65809 upgrade: remove upgrade_fix_block_instance_configuration

The upgrade_fix_block_instance_configuration() function was used
only by deleted upgrade steps so it's safe to proceed with straight
deletion, considering it internal. Deletion has been documented in
corresponding upgrade.txt files.

MDL-65809 environment: mbstring extension required

MDL-65809 environment: PHP 7.2 required

MDL-65809 environment: postgres requirement up to 9.5

MDL-65809 environment: mariadb requirement up to 10.2

MDL-65809 environment: 3.5 (LTS) required

MDL-65809 environment: 3.9 base information

This is a direct copy of the 3.8 branch to have changes
under control easier in next commits.

MDL-63650 core_message: Final deprecation of mark_all_read_for_user

MDL-67380 lib: Upgrade GeoIP2 lib to 2.10.0

MDL-67380 lib: Upgrade MixMind DB reader lib to 1.5.1

MDL-67380 lib: Update GeoIP2 and MaxMind DB reader versions in Moodle

weekly release 3.9dev

NOBUG: Fixed SVG browser compatibility

Merge branch 'install_master' of https://git.in.moodle.com/amosbot/moodle-install

Merge branch 'MDL-67151-master' of git://github.com/rezaies/moodle

MDL-67151 qtype_numerical: convert the tolerance to string before saving

Fix the sqlserver issue when saving a number into a text field

MDL-67523 core_admin: do not require admin to view category

Revert changes from MDL-58439 (in this file only)

Merge branch 'master_MDL-63795_core_setting_defaults' of https://github.com/mattporritt/moodle

Merge branch 'MDL-67483-qos-perf' of https://github.com/brendanheywood/moodle

MDL-63795 Administration: CLI upgrade apply all settings

This patch fixes a regression caused by MDL-62777.  MDL-62777 added output to inform
administrators of new default settings.  However, the recursion in the code did not
handle new settings made available as the result of the defaults of other settings
being set.
This patch fixes the issue, now all defaults are correctly set, even those exposed
after other defaults are set.

MDL-67483 tasks: Improvements to adhoc task queue at very high scale

Merge branch 'MDL-67151-master' of git://github.com/rezaies/moodle

Merge branch 'MDL-54554-master' of git://github.com/abgreeve/moodle

Merge branch 'MDL-67244-master' of git://github.com/ferranrecio/moodle

MDL-67527 lang: Propagate the string fixes to Behat and other places

MDL-67527 lang: Import fixed English strings (en_fix)

Merge branch 'MDL-64695' of https://github.com/paulholden/moodle

Merge branch 'master_MDL-66972_Streaming_file_types' of https://github.com/mattporritt/moodle

Merge branch 'MDL-67388-master-2' of git://github.com/rezaies/moodle

MDL-67388 lib: Upgrade babel polyfill to version 7.7.0

Merge branch 'MDL-66332-master' of git://github.com/ferranrecio/moodle

Merge branch 'master_MDL-67433' of https://github.com/golenkovm/moodle

Merge branch 'MDL-67381-master' of git://github.com/rezaies/moodle

MDL-66332 tool_capability: adding acceptance tests

MDL-66332 too_capability: add show differences option

MDL-67403 weblib: Add support for X-Redirect-By header

MDL-63996 core/tags: Pending JS for all tag code

MDL-67433 tool_task: Add limits to adhoc CLI runner.

Merge branch 'MDL-60854-master' of git://github.com/aanabit/moodle

Merge branch 'MDL-60855-master' of git://github.com/aanabit/moodle

Amended a couple of "depecated" typos

Merge branch 'MDL-67464-master' of git://github.com/sarjona/moodle

Merge branch 'MDL-65722-no-lock-db' of https://github.com/brendanheywood/moodle

Merge branch 'MDL-67304_master' of git://github.com/dmonllao/moodle

Merge branch 'master_MDL-67502' of https://github.com/golenkovm/moodle

Merge branch 'MDL-65735' of https://github.com/paulholden/moodle

Merge branch 'MDL-67165' of git://github.com/Chocolate-lightning/moodle_forum-project