DB-781 check killed in tokudb get_next to terminate a big partition copy.  should be done in partition storage engine, however

DB-787 the tokudb_report_fractal_tree_info_for_db function can leak a db on an error path where db->open fails

DB-766 use an extra flag that is supported on MySQL and does not require a tokutek patch to the wait_while_table_is_used function