Use a version_agnostic dest_course_id
Import Published content directly as Published, rather than a separate Publish call.

Conflicts:
	common/lib/xmodule/xmodule/modulestore/mixed.py
	common/lib/xmodule/xmodule/modulestore/xml_importer.py
fixup! Import Published content directly as Published, rather than a separate Publish call.
Check both draft and published branches when asserting course equality