(delete_entry, open_directory, open_file): Document that sanity-check revision may be unspecified.
(delete_entry, open_directory, open_file): Document that sanity-check
revision may be unspecified.

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