[PATCH] Hook script mailer.py: Allow certain paths to be excluded from the diff output

Currently the mailer.py hook script allows:
1. Diffs to be moved to another group (generates another email)
2. Certain types of diffs to be excluded (add/copy/delete/modify using
generate_diffs)

I'd like to exclude certain files from the diff output. This as the diff
of these files is not useful. I propose to do this using a new
configuration option called 'diff_exclude'. This is a regex of the paths
to exclude from the diff output.

I have the config option currently set to:
  diff_exclude = .*\.po$

See attached for a proposed patch. This is against Subversion 1.4.6 btw.

-- 
Regards,
Olav

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