Add a link to the demo dir.
Merge link addition from 3.2.
Merge link addition from 3.3.
#17079: test_ctypes now works with unittest test discovery.  Patch by Zachary Ware.
#17079: merge with 3.3.
#17082: test_dbm* now work with unittest test discovery.  Patch by Zachary Ware.
#17082: merge with 3.3.
Regex should be a raw string
Merge
Don't deadlock on a reentrant call.
Merge
#16935: unittest now counts the module as skipped if it raises SkipTest, instead of counting it as an error.  Patch by Zachary Ware.
#16935: update test_crypt now that unittest discover understands SkipTest.