Add some helpful headers to l10-report.py's output.
Add some helpful headers to l10-report.py's output.

* tools/po/l10n-report.py
  (svn:keywords): Set to 'all'.
  (_rev): New helper.
  (main): Include a couple of extra headers.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion