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Adam/merge release into master

MA-291 Allow API access without email activation.

TNL-1479

Conflicts:
	common/djangoapps/student/models.py
	lms/djangoapps/bulk_email/tasks.py

Ziafazal/entrance exam management on instructor dashboard

split up bulk email query for students and unenrolled course staff (TNL-...

Conflicts:
	lms/djangoapps/courseware/courses.py
	lms/djangoapps/instructor_task/api.py

refined entrance exam student attempts reset
added rescore, delete state and task history functionality

Preserve enrollment_action and course_id querystring params in header 'Sign In' button

Update translations (autogenerated message)

Fix right margin of LinkedIn add-to-profile button

Finish LinkedIn button

Add client-side analytics event for LinkedIn Add to Profile button click.

Add management command for generating certs for testing.

Update styling of the certificate messages.

Rollback override of lazy definition loading for large courses.

Convert enrollment already exists errors to success.

TNL-716: Add possibility for notes creation via keyboard.

Include middleware database queries in Django debug toolbar

Pass 'lazy' parameter down properly into low-level definition caching.
Adjust mongo call numbers in tests and add missing bulk_op wrapper.
Avoids the loading of all definitions in a large course when only
specific, filtered definitions are needed to be loaded for an endpoint.

Calculator UI difficulit to access

Flakiness fix for cohort group selection TNL-1479

CSS Background Image used for important link

Awais786/ecom 1046 add cert btn

JIRA: https://openedx.atlassian.net/browse/MA-290

ECOM-1046 minor change in code. rename file name.