(ba) This function checks /alk/ objects in a light way. For a more
complete checking one must use
The alk object to be validated.
It is the validity method for /alk/ objects.
The main idea is that non completed /alk/ must avoid the redundancy while completed /alk/ must have all slot filled in the standard way.
TRUE when the object seems acceptable else a character describing the error(s). Sometimes, when the inconsistency seems too severe, a fatal error can be issued.