Faction casters being improperly allowed Merc 'jacks

[Ghaz]

Currently the files are improperly allowing faction warcasters to field mercenary warjacks. Mercenary warjacks should be limited to mercenaries only. On top of that, certain mercenary jacks are showing as being valid for other mercenary warcasters when they are not. Here are the problem warjacks:

Mule - Should be limited to Magnus and Ashlynn only.
Nomad - Should be limited to Magnus and Ashlynn only.
Vanguard - Should be limited to Magnus and Ashlynn only.
Renegade - Should be limited to Magnus only.
Ghordson Driller - Should be limited to Gorten only.
Grundback Gunner - Should be limited to Gorten only.

Also, Greygore is still being shown as a solo instead of a unit when added to the roster in the Warmachine_1.ab files.