Allow 'svn cp iota iota2; svn rm iota2' if iota was originally
an unchanged file.

* subversion/libsvn_client/delete.c
  (find_undeletables): Allow unmodified copies to pass without
    noticing an unsafe to delete item.

* subversion/tests/cmdline/basic_tests.py
  (basic_delete): Extend to cover this change.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1442611 13f79535-47bb-0310-9956-ffa450edef68