Have svnmerge.py check for _svn directories to see if a directory is a working copy.
Have svnmerge.py check for _svn directories to see if a directory is a
working copy.

* contrib/client-side/svnmerge.py
  (is_wc):
    If _svn exists and is a directory, then return True.

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