Lets Necromancers migrate cities of living beings instead of ghouls. 

--Removes Ghoul migration option completely
--Living cities do not receive happiness penalty
--Necromancer Starts with Animate Ruins
--Only way to get new ghouled settlements is to raze and reanimate them
--Starting town is still a ghouled city

v1.1 Fixed inability to produce class buildings/units in living cities