MDL-39286 Remove link on My Courses settings heading
MDL-41446 Completion: Incorrectly marks complete when grade data present with no actual grade
MDL-40515: report_log: List activities in optgroups

Prevents users from generating reports on invalid values

Change-Id: If358fa06c8dadd33bb2875ea54ab4bce97b16aff
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-39489 behat: Updating to 2.6 moodlehq/behat-extension tag

Also solving new problem after Behat
2.5 upgrade.
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-42111 TinyMCE media preview: fix video preview display for TinyMCE media.

Effected themes: boxxie, clean, brick, formal_white and splash.
MDL-38664 Lesson mod: fixed re-attempt unseen page
MDL-38664 Lesson mod: code improvement for lesson re-attempt page
MDL-42453 theme_base: Fixed Error in base/style/admin.css that breaks CSS validator.
MDL-42464 mod_chat: Correct use of encoded & in link
MDL-42476 report_progress: don't browser sniff for SVG support

Use feature detection, its more robust and better practice.
MDL-42355 assignfeedback_editpdf - do not start a new comment immediately when deselecting the old comment
MDL-42494 Fix workshop coding exception if all assessments have zero weight

If all assessments for the given submission have zero weight, the grading
evaluation plugin "Comparison with the best assessment" is unable to decide on
the average assessment as it ignores those with zero weight. In such rare case,
it makes sense to set the grading grade to null and prevent the coding
exception.
MDL-42402 EditPDF: CSS Improvements for editing toolbar.

The main change here is to prevent the default rendering of a select list for the page
selector, so that it looks more consistent with the rest of the toolbar on different
browsers/os combinations.

This is done with some vendor specific css rules targeting webkit, mozilla and ie.

There are also some minor tweaks to vertically align the images in the buttons and reduce the padding
above and below the toolbar.