Not only do we no longer need it, but it hinders the ability to use
Berkeley's own db_dump and db_load utilities for, well, dumping and
loading this table because db_load doesn't do any custom sorting.
An alternative here, if we want to maintain the sort order (which, quite
honestly, makes debugging sooooo much easier since the sort order of
db_dump is intuitive), would be to write our own version of db_dump and
db_load ... svn_fs_dump_berkeley() and svn_fs_load_berkeley() which
understood our special sorting.