svn_fs: fix `SubversionChangeset.get_changes()` so that deletions actually show the deleted ''target'', which is not the same as the base path of the deletion in case the deletion is done after a copy or a move, within a same changeset.
Added a regression test.
Closes #4900.
Authored by: cboos 2010-02-26
Parent: [r9289]
Child: [r9291]
