The preferred form is to use CourseKey.from_string() instead of
SlashSeparatedCourseKey.from_deprecated_string().

TNL-3196

These signals are caught by the Teams app and used to update
`last_activity_at` on both teams and individual users.

TNL-2497

TNL-2864

New classes for the return type, and changes to the has_access function and tests to make them compatible.

Caches all permissions per user per course. Adds caching functionality to has_permission and replaces all instances of cached_has_permission with has_permission.

Also, fix the field-specific error format for all API endpoints.

This requires cs_comments_service commit fdf017c918.

TNL-650

Conflicts:
	lms/djangoapps/django_comment_client/base/views.py
	lms/djangoapps/django_comment_client/tests/test_utils.py
	lms/djangoapps/django_comment_client/tests/utils.py
	lms/djangoapps/django_comment_client/utils.py

This reverts commit 086a2ba7, reversing
changes made to a44132ec.  Some minor
code quality issues were addressed as part of this change.

Conflicts:
	lms/djangoapps/django_comment_client/base/views.py
	lms/djangoapps/django_comment_client/utils.py

TNL-650

TNL-735

TNL-172: Change type of a previously posted post. IMPORTANT: this commit depends on commit 774887b in cs_comments_service.

TNL-24

TNL-25

Also change server to pass post type through to the comments service.

Co-authored-by: jsa <jsa@edx.org>

The file size is calculated and displayed as a number of bytes, but was
being incorrectly labeled as 'K' [0].

The size is now correctly labeled as "bytes" and the sentence now begins
with a leading captial letter.

Impact: This has been broken on master since 2012 [1].

[0] https://github.com/edx/edx-platform/blob/master/lms/djangoapps/django_comment_client/settings.py#L4
[1] https://github.com/edx/edx-platform/commit/5d90366917c6e81513e26ea4cb8305df0f3e6d97

[LMS-2757]