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]

STUD-1595

This commit adds all of cms.

These keys are now objects with a limited interface, and the particular
internal representation is managed by the data storage layer (the
modulestore).

For the LMS, there should be no outward-facing changes to the system.
The keys are, for now, a change to internal representation only. For
Studio, the new serialized form of the keys is used in urls, to allow
for further migration in the future.

Co-Author: Andy Armstrong <andya@edx.org>
Co-Author: Christina Roberts <christina@edx.org>
Co-Author: David Baumgold <db@edx.org>
Co-Author: Diana Huang <dkh@edx.org>
Co-Author: Don Mitchell <dmitchell@edx.org>
Co-Author: Julia Hansbrough <julia@edx.org>
Co-Author: Nimisha Asthagiri <nasthagiri@edx.org>
Co-Author: Sarina Canelake <sarina@edx.org>

[LMS-2370]

STUD-1294

STUD-1006

on new Locators to make it clear that they have a different syntax
than Location.course_id altho they represent the same info.

usage_id implies self-sufficiency. The block_id is relative to its structure.

STUD-844

STUD-846

Make tests conform to new import UI

    And fixes for rebase-breakage.

Studio: revises import help/status copy to better reflect/generalize what is done with imported content

Add test cases for import status

Hook up view

Fix getStatus function

Signed-off-by: Julian Arni <julian@edx.org>