code: def link(self, thing1, thing2):
  		
  		thing1 = thing1.strip().lower()
  		thing2 = thing2.strip().lower()
  		if thing1 == thing2:
  			raise SameName("Attempted to link two of the same name")
  		self.change(thing1, 0)
  		self.change(thing2, 0)
  		return self._link(thing1, thing2)
docs: Link thing1 and thing2, adding the karma of each into
  		a single entry.
  		If any thing does not exist, it is created.