Add check to svnmerge.py init for an already initialized head.
Add check to svnmerge.py init for an already initialized head.

* contrib/client-side/svnmerge.py
  (action_init): Modified to print error message and exit, when the branch
  provided has already been initialized for the given head. This check is
  skipped on using the --force option.

Patch by: Madan U S <madan@collab.net>



git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@859390 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion