Masquerade should not apply to user dropdown

Have DiscussionXBlock take care of loading assets it depends on

Merge pull request #13538 from edx/ahsan/ECOM-4641-Invalidate-all-access-tokens-refresh-tokens-on-password-reset

Invalidate access token

WL-611: Fix "Access Denied" when downloading report

* Add openedx.core.lib.xblock_builtin.get_css_dependencies and get_js_dependencies,
  which respect PIPELINE_ENABLED setting when determining dependencies.
* Move new discussion-related Sass files into discussion subdirectory.
* Use "load_unicode" instead of "render_template" to load JS to add to fragment for DiscussionXBlock.
* Remove unused "course" parameter from context for DiscussionXBlock.student_view.
* Add RTL stylesheet for DiscussionXBlock, and enable the block to load correct stylesheet.
* Load MathJax only once, and include code for configuring MathJax in discussion bundle.
* Make sure username renders correctly in DiscussionXBlock response header.
* Move WYSIWYIG Markdown editor styles to _build-discussion.scss.
* Remove unnecessary import of discussion/utilities/v1-compatibility from _build-discussion.scss.
* Keep courseware-chromeless.html in sync with courseware.html.
* Load CSS for discussions on Teams tab.  This makes it possible to remove CSS for discussions from Sass files for "Course" tab.
* Load js/src/tooltip_manager.js, jquery.autocomplete.js and jquery.autocomplete.css on "Course" tab.

ECOM-4641

TIL about defining variables in Mako templates.

Exposes real_user to the user_dropdown template, allowing for the requested
feature change of keeping the profile links pointed at the real user's profile.

Unbreak master

This reverts commit 988bfa04.

This reverts commit 25bd32bc.

TNL-5643:
    test_lms_courseware:ProctoredExamTest.test_timed_exam_flow
TNL-4132:
    test_lms_matlab_problem:MatlabProblemTest.test_run_code
TNL-5582:
    test_studio_course_info.UsersCanAddUpdatesTest.test_delete_course_update
TNL-5691:
    test_account_settings.AccountSettingsPageTest.test_full_name_field

Potential Grades revert PR

This reverts commit 2ec95262.

Handle null weighted_possible values safely.

Added number receipt to the PDF filename

Lower case the term partner manager in UI strings

Rather than failing, treat them as unscored blocks.

[TNL-5689](https://openedx.atlassian.net/browse/TNL-5689): Server error when
checking a problem.

fire SCORE_CHANGED on student state reset

Leverage the catalog's exclude_utm parameter

We don't need stripping code on this end anymore. This closes out ECOM-5782.

Hotfix 2016-09-29b release to master

Drop noisy grades logging to debug level

Update translations (autogenerated message)

Install pa11ycrawler v1.5.4 from PyPi

Update grade when CAPA problem state is reset

These need to be dropped down to avoid splunk, as they are currently
flooding our infrastructure.

Fixed keyboard focus remains within modal simulated dialogs.

Merging Django 1.8.15 upgrade hotfix to master.

Fixes DOC-3360 to make help context-sensitive

WL-612 Report buttons are not displayed for White Label courses

Upgrade Django to 1.8.15

ECOM-4188
ECOM-5303

Create test to exercise grading multiple block types