[PATCH] Fixes for CLI repository root relative url support

Here are my fixes for the issues brought up last night and earlier today. The
tests are not in C because they require a working copy and repository
structure like that provided in cmdline.

[[[
Correctly handle non-canonical targets and targets containing peg revisions
while parsing repository root relative urls.

* subversion/libsvn_subr/opt.c
  (split_arg_at_peg_revision): New function.
  (svn_opt__arg_canonicalize_url,
   svn_opt__arg_canonicalize_path): Allow the input argument to contain a peg
    revision specifier, and preserve it in the output utilizing
    split_arg_at_peg_revision().
  (svn_opt_args_to_target_array3): Remove the peg revision preserving logic,
   relying instead on the new peg revision support in
   svn_opt__arg_canonicalize_path() and svn_opt__arg_canonicalize_url().

* subversion/include/private/svn_opt_private.h
  (svn_opt__arg_canonicalize_url,
   svn_opt__arg_canonicalize_path): Update the doc string to reflect the fact
     that these functions can handle a peg revision in the input argument.

* subversion/libsvn_client/cmdline.c
  (svn_client_args_to_target_array): Remove the peg revision preserving logic,
   relying instead on the new peg support in svn_opt__arg_canonicalize_path()
   and svn_opt__arg_canonicalize_url().
  (resolve_repos_relative_url): Fix an assertion failure in svn_path_join() by
   replacing it with apr_pstrcat() so that there is not a requirement that the
   input arguments be canonical. Also updated the doc string to reflect this.

* subversion/tests/cmdline/basic_tests.py
  (basic_relative_url_non_canonical): New test function.
  (basic_relative_url_with_peg_revisions): New test functions.
  (test_list): Call the new test functions.
]]]

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