Minor a11y fixes.

TNL-4112

Update bok choy tests to have unique emails.

Declare all packages.

edx-platform no longer using "-e" when installing

Bump version to 0.2.7.

Increase the final comment textarea size

Change how staff tool tabs work.

Always calculate peer median

The comment textarea size has been increase to 1000 and the final
comment size is smaller now. Increases to 1000 to match the comment
textarea size. Reference: https://github.com/edx/edx-ora2/pull/811

TNL-4021

TNL-4002

Previously, we were only showing the "more assessments needed" message
when there were 0 assessments, but we also need to show it when there are
0 < n < must_be_graded_by assessments for the user, to prevent a blank
area on the grade report. We also supress feedback comments from peers in
this case.

Required some refactoring of the base test case

Take care to avoid default behavior of get_workflow_info.

TNL-4060

Scope the submission response to the correct form elements.

Christina/fix pep8

Weekly Release

Add feedback text to self assessments

Also includes fix to default text, and removal of a seemingly unused,
hardcoded 'estimated_time' context variable. A11y test uncommented.

JS got out of sync.

Add pylint and pep, with thresholds.

TNL-3742

Final Grade section in staff tools

TNL-3930, TNL-3761

Staff Assessment section in staff tools

Generalizing the display of completed assessments in staff tools, and
including staff assessments in the view, which had previously been missing.

Includes a new unit test for this behavior, and updates acceptance tests as well.

Version bump for staff grading

New i18n strings for release