consolidate new post form variants into single client-side template/view
Merge pull request #4216 from edx/jsa/new-post-redesign

consolidate new post form variants into single client-side template/view
Asset support in split
LMS-2876

Conflicts:
	common/lib/xmodule/xmodule/modulestore/mongo/base.py
Asset support in split
LMS-2876
Move clone course into mixed ms and change to delegate smartly

Conflicts:
	common/lib/xmodule/xmodule/modulestore/store_utilities.py
Add copy_all_course_assets
fixup! Move clone course into mixed ms and change to delegate smartly
fixup! Asset support in split LMS-2876

Conflicts:
	common/lib/xmodule/xmodule/modulestore/mongo/draft.py
	common/lib/xmodule/xmodule/modulestore/split_migrator.py
	common/lib/xmodule/xmodule/modulestore/tests/test_mixed_modulestore.py
	common/lib/xmodule/xmodule/modulestore/tests/test_split_w_old_mongo.py
	common/lib/xmodule/xmodule/modulestore/xml.py