Set pixel at "x,y" to "state" where state can be one of "ON", "OFF"
	or "TOGGLE"

def set_pixel(self,x,y,state):
	"""Set pixel at "x,y" to "state" where state can be one of "ON", "OFF"
	or "TOGGLE"
	"""
	self.send_cmd("P"+str(x+1)+","+str(y+1)+","+state)