Review differences in primitive error conditions

[wyld-sw]

This could be used as a master list of primitives that have error conditions that could be seen as non-standard. We may not be able to "fix" these directly, as they've been around for a while.

Connection

• CONDBREF aborts with an invalid connection number, but DESCRDBREF returns NOTHING with an invalid descriptor.
• CONDESCR aborts with an invalid connection number, but DESCRCON returns 0 with an invalid descriptor.
• DESCRLEASTIDLE and DESCRMOSTIDLE would abort on an invalid descriptor, but a logic error prevents it.
• DESCRFLUSH and DESCRSECURE? proceed accept invalid descriptors, both returning 0.

Database

• NEXTENTRANCE requires M3, but ENTRANCES_ARRAY has no mlev restriction.
• ADDPENNIES aborts if the object is not a player or thing, but MOVEPENNIES does not for either object.