ENT-307: Add waffle switch to disable account activation requirement for onboarding

Basic support for an optional ICP number in the footer

Logging Sailthru api call time for exploring optimal connection timeout time

ECOM-7772

Update translations (autogenerated message)

Fix test to use the start instead of due date.

TNL-6832 | Grade reports should include unenrolled learners

	treat empty string as None for letter grades

EDUCATOR-283 Old mathjax not load in preview box.

Redo Bulk-reads and Request caching in Course Grade Reports

Show a welcome message on the course home page

This reverts commit b6b70401.

This reverts commit 5388d5d1.

LEARNER-879

Merge release back to master

LEARNER-922: Fix logic error in calculating last accessed.

Allow override of initial account activation from address.

In PR #15030, we missed adding the override of the initial account activation from address using the ACTIVATION_EMAIL_FROM_ADDRESS SiteConfiguration setting. We had only added the override when a subsequent activation email was sent.

ENT-318

Revert "Fix column alignment issue when Teams is disabled"

EDUCATOR-293 Remove flaky decorator from test_proctored_exam_flow.

This reverts commit e97283ae.

DOC-3411 Update lms_config.ini: instructor dashboard Help landing page

Swap direction of arrow for RTL.

Grade Report: Fix column alignment issue when Teams is disabled

Remove edx.org theme override of activation email body.

Generator expressions passed to the memcached backend's implementation of get_many() are exhausted prematurely. This results in KeyErrors when the backend tries to map keys returned by memcached back to keys passed by application code.

See https://github.com/django/django/blob/stable/1.8.x/django/core/cache/backends/memcached.py/#L99.

LEARNER-382

LEARNER-886 Fix check for image url on program detail page

Sstudent/revert grade reports

This reverts commit 16e96365.