Skip auto-enrolling users if they are already enrolled in their auto-enroll enabled courses to prevent downgrading users from paid course modes to audit/free course modes when they activate their account.

A major update to this function allows it to actually autofill the
certificate information again! I believe LinkedIn changed their API
and we never updated our end. This fixes that!

Plugins can listen to USER_ACCOUNT_ACTIVATED signal to perform custom logic.

PROD-1911

Allow entitlements to be used to upgrade to verified track past the
course enrollment date and before the upgrade deadline

PROD-1497

- Add a new CourseEnrollmentCelebration model, which ties a
  course enrollment to some booleans about progress celebrations
- Add serialization of the new model to the existing courseware_api
  app's existing course info view
- Add new API in courseware_api to update a celebration model

This patch improves on the user locked
out logic by providing a helping message
near locked out. This would help reduce
retries by giving user the option to use
password reset flow to fix the issue.

PROD-1505

Add list of states and field to UserProfile model; add migration; add
state field to relevant serializers and to
ACCOUNT_VISIBILITY_CONFIGURATION. Removes state data if country is
changed to something other than United States.

This was added in here as a shim to catch places that were still using
the old version of these models that had an attribute called course_id
instead of the `course` foreign key.  After monitoring production for
two weeks, we can be pretty confident that we've caught most places that
do this.  Removing this code since it should no longer be needed.

It conflicts with an underlying related field on that model which seems
to be getting at the same value from the related table.

Add logging for incorrectly instantiating CourseEnrollment models.
This is to catch any places that might break this that are outside of
edx-platform. Django won't accept `course` values that aren't
course_overviews so we don't need extra logic to test that `course`
values are of the correct type.

fixup! Remove the course_id property on student.CourseEnrollment.

* Reenabling this since the renames on the schedules table are completed

* Reverting regex change that caused migration to be generated for userprofile

This way if an audit user upgrades a self paced course to verified,
their schedule will reset to the current time.

AA-60

MST-121 We should allow the business case where a learner can be enrolled into a program, then unenrolled, then enroll into another program with the same course

This is so it's user editable in the Account MFE.

Adds a simple nullable field to the UserProfile model. The only
validation done it to make sure any character saved in that field is a
digit and not a letter. We do not distiguish on a model level if the
phone number is international or not.

Rather than to create or update the account recovery record when the
Account Settings page is updated, defer updating until the new
recovery email is confirmed

ENT-2607

add django simple history to student.ManualEnrollmentAudit

This adds request caching to the following places:
* course expiration wrapper (displayed in Units)
* offer banner generation (displayed in Units)
* get_enrollment
* user_by_anonymous_id
* youtube_disabled_for_course

On a sample course with edx-val enabled, this reduced the queries
for a large sequence from 450 to 155.

This will remove imports from __future__ that are no longer needed.

https://docs.python.org/3.5/library/2to3.html#2to3fixer-future

The previous behaviour of using a variable causes Django to complain
about changes not reflected in a migration when the default course
mode slug is changed.

PROD-826 - Add CourseWaffleFlag that restricts the set of ProblemGradeReport enrollees to only verified learners.

cr comments

added unit test

removed debug

style