EDUCATOR-4319 gradebook show student email only for master's track.

* INCR-245: Make compatible with Python 3.x without breaking Python 2.7 support > common/lib/capa/capa/safe_exec

* INCR-245: Add absolute_import to CODE_PROLOG

gradebook show student email only for master's track.

show emails for masters track - unit tests pass

fixed more unit tests and linting

Added history to CourseMode.

DE-1557

INCR-476

Added absolute import in both files

Python Requirements Update

INCR-477: Make compatible with Python 3.x

Mergeback PR from private to public.

geoip2: update maxmind geolite country database

Bump edx-enterprise to 1.6.15

Update dependency underscore.string to v3.3.5 [SECURITY]

Add strike-out price to LMS Course Home sidebar

Remove Remember me button from login page

Remember me button does the same thing regardless of if it is checked
or not. Remember me button being unchecked makes a user think they
will be logged out at the end of a browsing session when this is in
fact not the case

LEARNER-6220

Version bump for edx-enterprise

Added Staff Graded Points to CMS settings

Merge pull request #20825 from edx/matthugs/draw-full-name-from-correct-place-fixing-instructor-dashboard-launch

Backend-specific dashboard launches depend on the name field

... being set and fail if there is none. We were drawing in this
information from the auth_user.first_name and .last_name fields, which
are deprecated on the edX platform.

This reverts commit aef1986c.