SOL-1844 Allow for distinguishing between proctored exam and timed exam requests

Timed exam support burden alleviation

Small changes for support

-Remove difficult conditions language
-Hide request for extra time if > 20 hours

SOL-1802 Fix proctored exam serialization bug

Merge pull request #290 from edx/afzaledx/sol-1802_zendesk_tickets_for_suspicious_proctored_attempts

(WIP) SOL-1802 Create Zendesk ticket when "Suspicious" proctored exam reviews are received from the proctoring provider

Increased in-exam polling interval from 5 seconds to 30 seconds.

Added query parameter to identify the source of the call to the  AJAX endpoint edx_proctoring.views:StudentProctoredExamAttempt.get:

 ?sourceid=in_exam
 ?sourceid=instructions
 ?sourceid=app_shutdown

TNL-4366 Add ability to hide timed exam after due date

TNL-4366

This commit adds a new field, `hide_after_due` to the ProctoredExam model. This field
is intended to allow course authors to override the default setting and keep exam
results hidden from learners after the due date for the exam has passed.

Also included are migrations, tests, and api updates to allow this functionality to
be used.

fix the bug where 'Proctored Option available' appears on the left pa…

fix the bug where 'Proctored Option available' appears on the left pane for a proctored exam in an expired instructor paced course

Fix timer time difference

Pass requesting user on delete_student_attempt

The LMS implementation that will be performing this work is being changed
to require requesting user information as part of a seperate bugfix.

See TNL-4152, ARCH-18 for details.

let the student take exam without proctoring if the  exam has no due …

Afzaledx/sol 1653 course due date for self paced

update the due-date if different from context. This happens if the course has changed from instructor-paced to self-paced.

fixed the tests.

PR comments.

PR comments.

Incremented package version for 0.12.12

Fetch correct remaining seconds from proctoring

Incremented version for 0.12.11 release

PHX-250 / Emit an event for creation of attempt.

PHX-252 / Added check for practice exam when due date has passed

Ibrahimahmed443/sol 1611

Correct Django Requirement

Django 1.9a is less than 1.9 and should not be installed as a requirement.

Incrementing version for 0.12.10 release