Remove duplicated data from legacy events

When event-tracking was fully integrated into the platform, some data was replicated in the context in the middleware and then later extracted and moved the old location by event-tracking. The legacy code path was not updated to remove this transient shim data from the context resulting in duplication of the information. This patch ensures that the transient information is removed from the context before emitting the event.

Fixes: AN-2369
Use data dir from course.
Remove import.
Allow external_auth registrations to bypass PW complexity check
Updating SciPy
Revert "Merge pull request #4545 from edx/renzo/bi-analytics-overhaul"

This reverts commit 252038c37664f90d5967f93454a6f23a0938258e, reversing
changes made to 7caf8c53b1a32ded0da4a50429f397efb7ba1ffc.
Fix incorrect max upload file size on forums

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
Show category when an xblock does not have a default display name
Merge branch 'release'
Release notes 7-30
Merge pull request #4596 from edx/sylvia/docs/relnotes_7_30

Sylvia/docs/relnotes 7 30
Revert "Revert "Merge pull request #4545 from edx/renzo/bi-analytics-overhaul""

This reverts commit 079808ee474031e47ed7c83a61b407e5ab5bb7ab.
Serialize using to_json on fields
Count & compare db hits between old and split mongo
LMS-11090
check 0 sends means 0 not ignore
Move test_path_to_location to mixed testing
Convert toc test to use mongo not xml ms
Included adding a general create_toy_course and create_sample_course method for tests
Test both split and old mongo
fixup! Test both split and old mongo
fixup! Count & compare db hits between old and split mongo LMS-11090