Actor.setDifferentMajor()

USE:
Set the Major for the NPC to be a random subject but not the same as the player, both for teaching and studying.

TYPE: Command, Non-Ref
RETURNS: /
THEME: University
COMPARE: setMajor(), setSameMajor()

EXAMPLE:
    "I'm studying History"
    Actor.setSameMajor()
    "<Actor.name> is not my classmate."