MDL-39286 Remove link on My Courses settings heading
MDL-40939 tex filter: Changes to the TeX notation plugin

- Added configurable setting for path to mimetex binary
- Moved language strings from lang/en/admin.php to lang/en/filter_tex.php
- Config settings now stored in table config_plugins and retrieved
through get_config
- Added upgrade step to move TeX settings to the config_plugins table
and delete settings from the config table

AMOS BEGIN
  MOV [configconvertformat,core_admin],[configconvertformat,filter_tex]
  MOV [convertformat,core_admin],[convertformat,filter_tex]
  MOV [latexpreamble,core_admin],[latexpreamble,filter_tex]
  MOV [latexsettings,core_admin],[latexsettings,filter_tex]
  MOV [pathconvert,core_admin],[pathconvert,filter_tex]
  MOV [pathdvips,core_admin],[pathdvips,filter_tex]
  MOV [pathlatex,core_admin],[pathlatex,filter_tex]
AMOS END
MDL-32888 Grader report: added user search
MDL-32888 Grader report: refined user search
MDL-32888 Grader report: refined user search with no reset
MDL-32888 Grader report: cater for suspended students
MDL-32888 Grader report: use SESSION object and DB functions
MDL-32888 Grader report: Refined SESSION and api function use
MDL-42084 Core: Create new static class for use instead of set_time_limit
MDL-42084 Backup: Update time limit to avoid regression, use new class
MDL-42084 Core: Change set_time_limit to core_php_time_limit::raise everywhere

Exceptions (places where set_time_limit is still left) are:

Third-party libraries:
  ADODB
  PHPMailer

Moodle core:
  PHPUnit - not relevant (CLI mode)
MDL-42084 Unit tests: Remove unnecessary 'clear time limit change' lines
MDL-33618 Messages: Added support to disable message provider
MDL-42876 Screen reader does not trigger the keyboard move
MDL-40191 navigation: do not throw an error if activity is not visible

navigationlib is not the place to check it, let the page itself decide what to do in this case
MDL-42969 Main Menu Block loses ability to move resource or activity up or down (add back exact same behavior than in 2.5)
MDL-42918: fixed fullscreen width for multichoice answers editor
MDL-43018 JavaScript: Correct joining of multiple minified JS

When minifiying JS, unnecessary semi-colons are removed - this includes the
trailing semi-colon.

Since we join multiple files together after minification, we need to add an
additional semi-colon in this situation to produce valid JavaScript.
MDL-43068 course&gradebook: show/hide cm & CONTROLS_GRADE_VISIBILITY

Making a quiz visible on the course page, of via the settings form,
could cause the grade item to become visible in the gradebook, even
though the quiz supports FEATURE_CONTROLS_GRADE_VISIBILITY to ensure
that when the grades are hidden in the quiz settings, they do not appear
in the gradebook.

Now, if a module supports FEATURE_CONTROLS_GRADE_VISIBILITY, then
set_coursemodule_visible calls the _grade_item_update callback to update
the grade item(s).

In addition, there was a bug when saving the quiz form, where it used
the value of $cm->visible from the database, which was wrong if the
value of cm->visible had just been changed on the setting form.
MDL-42951 curl: Always keep the last headers of a request