* contrib/client-side/svnmerge/svnmerge.py   (display_revisions, command_table): add '--summarize' option,    pass it to 'svn diff'.
* contrib/client-side/svnmerge/svnmerge.py
  (display_revisions, command_table): add '--summarize' option,
   pass it to 'svn diff'.

Patch by: Archie Cobbs <archie@dellroad.org>
Review by: Giovanni Bajo <rasky@develer.com>
           Jon Schewe <jpschewe@mtu.net>

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