EDUCATOR-333: Grade each course subsection exactly once; ensure that our stashed, unsaved subsection grades are unique.

PSA was monolothic, now split, with new features, like
a DB-backed partial pipeline. FB OAuth2 version also upped.

Partial pipelines don't get cleared except when necessary.
They persist for special cases like change of browser while
still mid-pipeline (i.e. email validation step).

Refactor, cleanup, and update of a lot of small things as well.

PLEASE NOTE the new `social_auth_partial` table.

EDUCATOR-341

Learners now see a message informing them that their status is denied rather than expired.

LEARNER-1486

If verification status is pending, the top border is now colored blue, in a manner similar to the success and failure states.

LEARNER-1486

When authenticating using an SAML IdP, gather additional user
data besides what is standard. Requires admin to input JSON
in settings to recognize the additional user data.

ENT-448

Hiding 'Resume Course' button for users that are not enrolled in the course and adding test to assure behavior.

This sock sits at the bottom of both the home and the course content pages. It allows the user to click a 'Learn More' button to open a panel that allows the user to navigate to the upgrade checkout page. The sock is only shown for users that have not yet upgraded in a course that has a verification upgrade date that has not yet passed. Python tests cover the various course mode and upgrade dates.

This feature is not always needed and is not properly provisioned for devstacks.

This reverts commit e58e295c.

This is to fix learner-1464

2) Updating the course experience sass file to use variables it can reference in the version two variable sass file.
3) Updating date styling on course home page as explained in LEARNER-1297.
4) Expanding side outline panel to take up a third and not a quarter of the content size.

Revert "EDUCATOR-394 Disable self generation certificates when course is reset to instructor-paced."

LEARNER-1341

LEARNER-1112

Added course level lang attribute for LMS

added lang attribute to Studio

fixed error when trying to get language attribute on course that does not exist

simplified code

added lang attribure to more places in LMS, added migration for language attribute in course_overview

fixing contraints in the database for language attribute

added lang attribute to several more places in LMS and Studio

added lang attribute to discussion and custom pages; cleaned up code

fixed issue that was causing test failures

moved lang attribute higher in tree in two places

Open Response Assessment tab for Instructor Dashboard - bugfix (prevent loading ORA Block more than one time)

- Keeps platform set default of "Audit" to be backwards compatible and not break stuff
- get COURSE_MODE_DEFAULTS from config if set

move tasks into tasks.py

add more logging

[LEARNER-1393] Filter program course runs by status