CommaSeparatedIntegerField is deprecated, this is the replacement. I
have confirmed there is no SQL generated for this migration since it is
already a CharField behind the scenes.

This new property knows how to rely on schedule deadliens and fallback to course mode deadlines, when necessary.

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

This reverts commit 5388d5d1.

This reverts commit 16e96365.

ECOM-5081

* mattdrayer: Add bulk checkout link to course views
* asadiqbal08: MAYN-225 replace the "Verify Now" button by the "Go to Dashboard" button in case of themed sites.
* mattdrayer: Add bulk_sku check in courseware.views

* mattdrayer: Add bulk checkout link to course views
* asadiqbal08: MAYN-225 replace the "Verify Now" button by the "Go to Dashboard" button in case of themed sites.
* mattdrayer: Add bulk_sku check in courseware.views

The verification workflow assumes that all verified courses will have a
price. Free verified course modes cause a 404 when the user attempts to
enroll or upgrade.

Add app_label definitions in Meta classes for models.
Move import of course_mode model into methods to prevent importing
the models at startup time.

The verification workflow assumes that all verified courses will have a
price. Free verified course modes cause a 404 when the user attempts to
enroll or upgrade.

Two new certificate statuses are introduced, 'audit_passing' and
'audit_notpassing'. These signal that the GeneratedCertificate is not
to be displayed as a cert to the user, and that they either passed or
did not. This allows us to retain existing grading logic, as well as
maintaining correctness in analytics and reporting.

Ineligible certificates are hidden by using the
`eligible_certificates` manager on GeneratedCertificate. Some places
in the coe (largely reporting, analytics, and management commands) use
the default `objects` manager, since they need access to all
certificates.

ECOM-3040
ECOM-3515

This reverts commit 60860e3a.

An `eligible_for_certificate` field is added to the
GeneratedCertificate model. This way we can retain existing grading
logic, as well as maintaining correctness in analytics and reporting.

Ineligible certificates are hidden by using the
`eligible_certificates` manager on GeneratedCertificate. Some places
in the coe (largely reporting, analytics, and management commands) use
the default `objects` manager, since they need access to all
certificates.

This commit also updates the DB cache for acceptance tests.

Remove cert messaging from audit cert/grade info partial

move enrollment display method to helpers

ECOM-2972

Also remove useless docstrings where they were added to keep pylint
quiet.

Fixing certificates for credit mode.
ECOM-1988

Using SKU to choose course mode when creating an order.

ECOM-2172

fix error where users who received a no-id-professional certificate did not get a link on his/her dashboard to download the PDF