#6075: make idle work with both Carbon AquaTk and Cocoa AquaTk. Patch by Kevin Walzer and Ned Deily.

Issue 10611. Issue 9857. Improve the way exception handling, including test skipping, is done inside TestCase.run

#10573: use actual/expected consistently in unittest methods. The order of the args of assertCountEqual is also changed.

Such addresses are not RFC compliant except under the 'obsolete syntax'
rules, but before this fix the whitespace was dropped from the input,
concatenating the pieces.  That breaks one of the principles of the
email package, that of preserving the input as much as possible.
It also denies the application program the opportunity to apply its
own heuristics to interpretation of such non-compliant addresses.

It is possible users of the email package were depending on the local
part always being a single token, so this fix will not be backported.

This provides access to the context menus where they previously could
not be accessed due to the way OSX Tk binds buttons.  It also
improves platform consistency.

Patch by Ned Deily.

Add subparser aliases for argparse. Resolves issue 9324. Approved by Georg for beta2 on the tracker.

editline rl_initialize apparently discards any mappings done before it
is called, which makes tab revert to file completion instead of inserting
a tab.  So now on OSX we call rl_initialize first if we are using
readline, and then re-read the users .editrc (if any) afterward so they
can still override our defaults.

Patch by Ned Deily, modified by Ronald Oussoren.