Mysql.result: Renamed seek() to low_seek(). This function performs absolute positioning (rather than the relative positioning of __builtin.Sql.Result()->seek()), and was shadowed by a generic (relative) implementation in previous versions of Pike. CAVEAT: Old code that used sql_res->master_res->seek() will break and need to be updated. Any such code will trigger warnings as master_res has been declared deprecated. It is also unlikely that any such code exists, since the function didn't comply with its documented behavior. Fixes some testsuite failures.