Issue #17414: Add timeit, repeat, and default_timer to timeit.__all__.
Revise module docstring and update itertools import and use.
Issue #17047: Add news entry
Merge with 3.2: issue #17047 news entry
Merge with 3.2: closes issue #17047
#1291 http.server's send_error takes an optional explain argument
Issue #17398: document url argument of RobotFileParser
Merge with 3.2
Merge with 3.3