Patch to add argument parsing classes to gdb

[Robert Lupton the Good <rhl at astro dot princeton dot edu>]

Dear GDB,

I'm attaching a patch that implements two classes, GdbOptionParser and GdbArgumentParser, which are built around python's standard optparse and argparse but play well with gdb (e.g. don't call exit if you make a typo or ask for help!).  The code imports with python >= 2.3, but only provides the argparse-based parser if you actually have argparse in your path (python == 2.7?).

The patch:
	Implements the classes
	Adds docs
	Adds test cases

What else do you need to get this into the source tree?  I just faxed the copyright assignment to FSF.

						R

P.S. This patch is slightly improved from one I sent in error to gdb@sourceware on November 11, 2011

Attachment: rhl.argumentParsing.patch.3
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