Optimize the dotpath and backpath detection functions.
Optimize the dotpath and backpath detection functions.

* subversion/libsvn_subr/path.c:
  (svn_path_is_dotpath_present, svn_path_is_backpath_present): revamp to
    look at the characters in the string rather than calling various
    string functions.

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