rename djang-babel to enmarker
upgrade the reqs

updated the constraints order

Remove pystache_custom dependency.
Upgrade requirements.

https://openedx.atlassian.net/browse/BOM-1670

Move sorl-thumbnail dependencie from github.in to base.in since PyPi version is now compatible with DJango 2.2 and python 3.5.

and make upgrade.

We will now show the problem icon if the LTI problem
is scored and 'other' if it is not.

Cleaned up a few more things about the testing configuration now that we've deployed Django 2.2 to production:

* Go back to a single version of django-oauth-toolkit, tox doesn't need to vary it anymore
* Go back to PyPI release of django-method-override
* Remove no longer needed dependency on python-oauth2 (we already removed the package it was used by)
* Update prepare_xdist_nodes.sh with new Django requirements file options

In the course outline, if a subsection has any graded content,
show a graded icon (the pencil icon).

Also, show the graded icon for LTI xmodule units (xblocks is a
different repo, but will get same treatment).

AA-75

TNL-7184

This adds contraints to:
kiwisolver: next release only works with python>=3.6

The was run to upgrade:
django-splash
django-wiki
edx-search
The previous versions were constraining django below 2.0.

Co-authored-by: Robert Raposa <rraposa@edx.org>

removed extra dependency

fixed tag issue

checking django-wiki and fixing deprecation warnings.

We upgraded these before in https://github.com/edx/edx-platform/pull/23119 along with django-countries (which released a new version just before that), but had to revert in https://github.com/edx/edx-platform/pull/23237 because of a performance regression in the admin page for EnterpriseCustomer.  We think django-countries was the culprit and have pinned it, so trying these two again by themselves.

- switches to openedx-calc from PyPI
- includes edx-rest-api-client major upgrade.

ARCHBOM-952

Update ORA to 2.6.16 | Fixes the text_response property to be more backwards-compatible with _old_ ORA blocks.

This reverts commit 140738df.

-django-babel-underscore custom version to support django>=2.2

Upgrade ORA to 2.6.12 | When fetching file URLs from keys stored in Submission records, don't break just because we encountered one missing file; there might be more, existing files after it.

* Removing deprecated rest_framework_oauth library

* removing dependecy of django-rest-framework-oauth

* removing oauth_provider from cms

This reverts commit 1f32bc63.