[PATCH] commit-email.pl: support subject line based on log message

This adds to commit-email.pl a flag --summary,
which produces subject lines like
  r123 - Stop frobbing the veeblenitzer
instead of the familiar
  r123 - in src/veeble: . nitzed
, copying the first line of the log message into the subject line.

[[[
* tools/hook-scripts/commit-email.pl.in
  Support --summary for taking subject line from log message.

Patch by: Greg Price <price_at_mit.edu>
]]]

I've generally preferred this form of subject line in the small
projects I've worked on, and would be very pleased to get it with
a flag rather than patching commit-email.pl every time.

Greg

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