issue #18698: ensure importlib.reload() returns the module out of sys.modules.
Issue #18296: Try to fix TestSendfile.test_trailers() of test_os on FreeBSD
Issue #18425: Unittests for idlelib.IdleHistory. First patch by R. Jayakrishnan.
Issue #18732: Remove unused* parameter output_sep from IdleHistory.History
and paired splits and joins that do nothing when output_sep is its default \n.
*It in unused in that the class in only instantiated once, with the default.
Make a few other changes in .fetch and its test.