Fixes to start Studio.
Remove TEST_MODULESTORE settings override
it was obsolete
Fixed test_item.py.
More test fixes
 #Fix test_sysadmin.py.

Fix LMS and CMS acceptance and unit tests.
Clean up the semantics of delete_item

more fixups
Implement has_item in draft.py.

Fix test_courses.py.

renamed revision values.

fixing clone

Fix prefetching test.

Fix more LMS acceptance failures.