Fix help modal css selector
Remove antiquated cleanup script

This script was originally written to clean up XML scripts. In the more
than two years since it was originally written, the only updates it has
received have been to remove PEP8/PyLint/quality violations.

It's hard to imagine that this is still useful to anyone, though I'm
open to discussion.
config refactor wip
merging from master
pep8 and comments
Moved has_course_access from CMS to student.auth (common)
Change has_course_access definition and doc string

- has_course_access renamed to has_course_author_access for clarity
- Changed doc string to clearly state that it determines whether or not
  a user has write access to a course
Split mongo support for libraries and Library XBlock
Add BI events for tracking email opt-ins
LMS: fix - visually hiding calculator toggle label
renmaing prod.py and setting more defaults
Remove extra prerequisites style and add classes
Refrain from setting email opt-in preference when checkbox is missing
Merge pull request #6133 from edx/renzo/track-email-opt-in

Add BI events for tracking email opt-ins
renaming to use underscores
Add compare-branch option to paver run_quality
Merge pull request #6149 from edx/talbs/fix-lms-calculator-toggle

FIX - LMS: Calculator Toggle Label Display
Merge pull request #6137 from edx/renzo/missing-checkbox-absent-preference

Refrain from setting email opt-in preference when checkbox is missing
Fixed plus sign icon for overall grade range add button.
TNL-890
Merge pull request #6143 from edx/waheed/tnl890-fix-plus-sign-overall-grade-range

Fixed plus sign icon for overall grade range add button.