Dropped old insert_id and insert_id_ext and only kepy insert_id_arr.
Added insert_id_pk_name to get the inserted pk name.
Insert RETURNING also works on non set pk name with RETURNING set
Moved the get insert (RETURNING) into method so it can be called from
both dbExec and dbExecute flow.
Error code 31 is only thrown if no returning is set and insert flow
cannot find a primary key for this table
Update all old insert_id calls from other classes
5230cbf5d3