[DU] Research machine lets you research Thanatology when L&D not installed

@januksenkosketusThanatology is a base game update that came with the Life and Death base game update that changed ghosts, you don't need life and death to play the Ghost occult, but you won't get all the good features that come with life and death like soul journey and rebirth. Your just get play as ghost or have the ghost wonder the world. 

Edit:  I forgot you won't get the active career that comes with Life and Death, but notice sure if you get the other career or not.