[PATCH] Relative path copy and move tests

While working the multiple moves branch, I've expanded the relative move
test added in r20698. These are general tests, not specific to the
multiple moves branch, so I'd like them added to trunk. I've also moved
the original test from basic_tests.py to copy_tests.py.

For the curious, they are marked XFail due to a known bug in windows
apr. See issue 1869 for details.

-Hyrum

[[[
Followup to r20698, move and expand copy and move tests regarding
relative paths.

* subversion/tests/cmdline/basic_tests.py
  (move_relative_paths): Rename and move to copy_tests.py

* subversion/tests/cmdline/copy_tests.py
  (move_to_relative_paths): Copied from basic_tests.py.
  (move_from_relative_paths, copy_to_relative_paths,
  copy_from_relative_paths):
  New, mostly copied from move_to_relative_path().
]]]