This change adds the page_contract filter "object_id", which validates values whether these are syntactically acceptable as object_ids in PostgreSQL and Oracle.
Note that before one is able to use the filter, the server has to be restarted. Otherwise, when e.g. "apm/version_reload.tcl" would be executed with the new filter, it would fail. So, one has to be careful on update scripts, when people upgrade from old version not to create a blocking mutual blocking condition.