Trying to use run_tests.py for testing is more trouble than it's
worth; reverted to rt.bat.  Also cleaned up rt.bat a bit.

Trying to use hg purge to clean up after testing is also
error-prone, so we're back to using the build solution's Clean
targets.

The function schedules the execution of coroutines, it's not just a wrapper for
something.

Patch by Michel Albert.  We don't normally do patches that just tweak
whitespace, but ipaddress is relatively new and the package maintainers
approved the patch.

Fix also the reate_unix_connection() doc: the method is not support on Windows,
not need to mention that ssl is not support with ProactorEventLoop.

Patch by Meador Inge.

This gets rid of  Tcl warnings when they are handled later when the root is
already destroyed.

This gets rid of  Tcl warnings when they are handled later when the root is
already destroyed.

Patch by Chris Jerdonek.

Patch by David Naylor.

Add "closed" or "closing" to repr() of selector and proactor transports

Add "closed" or "closing" to repr() of selector and proactor transports