A custom argparse help formatter.

Review Request #817 — Created Aug. 1, 2014 and submitted — Latest diff uploaded

benjyw
pants
pants-reviews
zundel
Squelches the extraneous parts of the argparse help message
(headers, usage etc.) since we format those ourselves. Leaves
just the per-flag help.

Note that subclassing the formatter is an official part of the
argparse API, so this is not underhanded or fragile.


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