This reverts commit cdb06198,
which itself reverted 3ca00621.

The original commit (3ca006) was reverted because it was suspected
that it was causing unexpectedly-increased memcached usage and
500s in the Gradebook API. It is not clear whether that is actually
the case. We are optimistically reinstating 3ca006 and will monitor
production to see if there is an adverse effect.

MST-105

Updated the django-ratelimit to add support for Django 2.2

If there is no dropdown for a course but there is another course in program
which have a dropdown, $('.run-select').val() returns that run's value. Fixed
by using $el.

PROD-1217

Order history removed from dashboard

Learner who have already earned PDF honor certificates in old courses
are unable to see the certificate links on dashboard and course progress
pages since `course.cert_html_view_enabled` is deprecated and default to
True for all courses.

PROD-60

Updating the django-rate-limit requirement.
updated the django-ratelimit to use unreleased version that supports Django 2.2

add stubbed api functions, tests

Otherwise it fails to go fullscreen before playback

Unpin edx-rest-api-client and make upgrade.

upgrade edx-enterprise to 2.1.4

[REV-1071] add more incomes

[TNL-7051] Clicking a video XBlock's fullscreen button now takes the video fullscreen instead of full window.

Gracefully fallback to full window if fullscreen apis are absent

Warning added in admin

PROD-1153

modify URL generation in tinymce editor

BOM-1143 Django-auth-toolkit update

Django-auth-toolkit update

Pinned the latest commit from github to get Django2.2 support in testing.
Pinned the zipp<2.0.0 to get Python<3.5 support too.

This reverts commit 3ca00621.

* Constraining edx-rest-api-client

* Decreased pin on edx-rest-api-client from <3.0.0 to <2.0.0

The functions `CourseOverview.get_from_id_if_exists`
and `CourseOverview.get_from_ids if exists` are bug-
prone, in that they do not go to the modulestore
when a CourseOverview is out-of-date or uncached.
The docstrings spell this out, but callers seem
not to understand the implications.

So, in this commit, we:
* Remove both functions
* Add `CourseOverview.get_from_ids` for almost-as-fast
  yet safer bulk-fetching of overviews
* Update call sites to use `course_exists` or `get_from_ids`
  in place of the old functions.
* Add tests for @verify_course_exists.
This PR should specifically fix an issue where
the program_enrollments API was breaking when the CourseOverview
version was bumped.

CR-1708

PROD-799

Unpin several more outdated dependencies whose changelogs don't contain any significant backwards incompatible changes. Also add "moto" to the list of packages to uninstall from existing environments, since it requires a jsondiff version that clashes with the one we now use (triggering a harmless but distracting warning on dependency updates).

We can potentially stop using path.py/path altogether by switching to pathlib in the Python 3 standard library, but that merits a separate PR of its own.

Also, note that I'm not actually unpinning freezegun; different PRs restricted it in both constraints.txt and test.in, I'm just removing the latter redundant constraint.

Fixed bytes in filename

BOM-1156 : Bridgekeeper Fork Update

Remove null, blank from start field in Schedules. Step 4/5

Updated border color on login page fields Ally

fetch lms root url using configuration helper