Make svnmerge.py's "multiple heads found" error message more informative.
Make svnmerge.py's "multiple heads found" error message more
informative.

* contrib/client-side/svnmerge.py
  (get_default_head): Change the error message printed when multiple
   source URLs are found by listing all available URLs.

Patch by: Madan U S <madan@collab.net>
Review by: giovannibajo
           dlr
           djames


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@859412 13f79535-47bb-0310-9956-ffa450edef68

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