MDL-39563 Fixing mobilecssurl is not being returned in WebService get_siteinfo function
MDL-35131 Caching: Purge all will clear course modinfo cache - Thanks to Thomas for patch
MDL-40368 tool_capability: overall improvements made

* Can now compare multiple capabilities at the same time.
* Capability search now persists between requests.
* Upgraded to use renderers.
* Upgraded module.js to YUI shifted module.
* Converted deprecated calls.
* Converted forms to Moodleforms.
* Implemented backend functionality to overview at
  different context levels. Not possible presently as
  there are no front end hooks.
MDL-39020 phpunit: Rename incorrect filename

Rename externallib_tests.php to externallib_test.php
Fix failing unit tests
MDL-40358 Administration: Added group and status filter on user enrolment page
MDL-40386: Fix for updating timemodified field in book_chapters
MDL-40412 course Expanding the height of module description fields.

Expanding the default height of mod descriptions to 10, which gives
you 3 real lines once TinyMCE Loads.
MDL-40368 tool_capability: clean up as per notes from peer-review.

* Coding style clean up.
* SQL indentation
* Removal of non-matching capabilities when searching.
* Fixed notices/warnings when hitting enter on search.
MDL-40434 calculatedmulti multiple-response questions not randomised
MDL-40440 Backup: Skip files that already exist
MDL-37065 - Change get_string('status') token in assignment submissions page to a different token (for translation flexibility)

AMOS BEGIN
 CPY [status,core],[status,mod_assign]
AMOS END
MDL-38314 repository: Remove orphan repository instances
MDL-38314 repository: Delete repository instances on context deletion
MDL-38314 repository: Unit Tests for delete_all_for_context()
MDL-40472: Clean all codechecker warnings on mod_assign
MDL-38314 repository: Improving performance of upgrade script
MDL-40369 theme: Fix core using deprecated icons
MDL-40369 theme: Remove deprecated icons
MDL-40369 theme: Afterburner does not override deprecated icons
MDL-40369 theme: MyMobile does not override deprecated icons