Issue #2028: Prepare for move from svn_path* to svn_dirent* and svn_uri* API.  Document current (buggy) behavior of the svn_path* functions in terms of more testcases. 
Issue #2028: Prepare for move from svn_path* to svn_dirent* and svn_uri* API. 
Document current (buggy) behavior of the svn_path* functions in terms of more
testcases. 

Most of this testcases are ressurected from r23906.

* subversion/tests/libsvn_subr/path-test.c
  (test_is_url, test_is_uri_safe, test_join, test_basename, test_dirname,
   test_decompose, test_canonicalize, test_remove_component,
   test_get_longest_ancestor, test_splitext,
   test_compose): Rename to test_path_*.
  (test_is_root): Rename to test_dirent_is_root.

  (test_path_is_url, test_path_join, test_path_basename, 
   test_path_dirname, test_path_canonicalize, 
   test_path_remove_component, test_path_get_longest_ancestor): Add new testcases
    for Windows dirents and UNC paths.

  (test_funcs): Update to renamed test functions.

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