command helper functions.

See #6479 for some motivation.

Since there is no official mapping file from unicode.org,
the codec file is generated on Windows with the new genwincodec.py script.

This should allow direct compilation from a downloaded source tar ball.

Add more tests for the xlmrpc.ServerProxy

Patch by Mads Kiilerich, Reviewed by Barry Warsaw.

According to #6358, python 3.0 has a different implementation that behaves differently.

Need to be careful with thread switching when testing the xmlrpc server.  The server thread may not have updated stats when the client thread tests them.

PIPE_BUF is not defined on Windows, and probably has no meaning there.

Anyway the subprocess module uses another way to perform non-blocking reads (with a thread)

cleanup.  If this fix works, it means that Solaris is unique among
our platforms in what happens when shutil.rmtree is called on the
current working directory (ie: it doesn't work on Solaris, but
it does everywhere else).

if the test gives useful failure info on Solaris buildbot.

(I copied this from another import test, but currently this will fail if
TESTFN ends up in /tmp...see issue 2609).

and make sure we test resetting all three execute bits.