Improvements to svnmerge.
Improvements to svnmerge.

* contrib/client-side/svnmerge:
  To make bi-directional merges easier, find the target's repository
    local path so it can be removed from the list of possible
    integration sources.
  Do not allow trailing /'s in URLs or in repository local paths.
    Check for trailing /'s and give steps to remove them from the
    repository.
  Strip trailing /'s from source URLs given on the command line.

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