when serving course export tarball.

request.POST to eliminate Django deprecation messages.

This reverts commit 2bfbda3c.

The old line:

    from path import path

produced pylint errors because of the baroque way that path.py defined
"path".  We tried to get them to change how they defined it, but they
deleted the name instead: https://github.com/jaraco/path.py/issues/102

(Jason then changed his mind, but this is a better way to use path.py,
it avoids the pylint error at least.)

This reverts commit c94abd27.

This reverts commit c94abd27.

This is a public, versioned, RESTful API for importing and
exporting full course content. The code was initially ripped from the
existing import/export API in the CMS contentstore djangoapp and wrapped
in Django Rest Framework view classes. It's a new djangoapp in
the openedx directory which is largely an abstraction off the CMS
Import/Export views.

This PR includes configuration changes. Most notably, Studio is
configured to serve the OAuth2 provider alongside the LMS.

This is the initial thread on the code list:
https://groups.google.com/forum/#!msg/edx-code/DmnHWmly25A/ZqjD1zb4o7oJ

And this thread contains another description of the changes:
https://groups.google.com/d/msg/edx-code/6dP9SEKsmqQ/Pvyn8fBDx68J

There are a numerous non-covered lines, all of which are missing
coverage in the CMS API this was ported from. They're mostly error
conditions, such as handling of multipart file upload errors.

This makes these files importable, and puts them into the new best guess
as to where files should live.

- 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

if import restores a deleted draft element which was never published
PLAT_297

PLAT-88

STUD-2017

Remove post-publish step.

STUD-1754

do the import from wherever it unpacked.
Avoids an exception where the top-level dir had a subdir of same name
as one being moved, but also just makes it faster.

Refactor get_parent_locations STUD-1663

[LMS-2757]