Fix bug 544473 - "Queue module can deadlock".
Use try/finally to ensure all Queue locks remain stable.
Includes test case.  Bugfix candidate.

Original patch(es):
python/dist/src/Lib/Queue.py:1.15

added test script and expected output file as well
this closes patch 103297.
__all__ attributes will be added to other modules without first submitting
a patch, just adding the necessary line to the test script to verify
more-or-less correct implementation.

    1. Comments at the beginning of the module, before
       functions, and before classes have been turned
       into docstrings.

    2. Tabs are normalized to four spaces.

Also, removed the "remove" function from dircmp.py, which reimplements
list.remove() (it must have been very old).

+ Implements a put_nowait method.
+ Adds a corresponding Queue.Full exception.
+ Simplifies the implementation by adding optional "block" args to get() and
put(), and makes the old get_nowait() and new put_nowait() one-line
redirections to get() and put().
+ Uses (much) simpler logic for the nowait cases.
+ Regularizes the doc strings to something closer to "Guido style" <wink>.
+ Converts two stray tabs into spaces.
+ Removes confusing verbiage about the queue "not being available" from the
docstrings -- never knew what that meant as a user, and after digging into
the implementation still didn't know what it was trying to say.

and release() instead.

lines to doc strings.