Deletes the values for a QuantFigure
		The key-values are automatically deleted from the correct 
		section of the QuantFigure

def delete(self,*args):
		"""
		Deletes the values for a QuantFigure
		The key-values are automatically deleted from the correct 
		section of the QuantFigure
		"""
		if args:
			args=args[0] if utils.is_list(args[0]) else args
			path=utils.dict_path(self.__dict__)
			for _ in args:
				if _ in self.__dict__.keys():
					raise Exception('"{0}" cannot be deleted'.format(_))

			for a in args:
				try:
					if a in ('shapes'):
						self.layout[a].clear()
					elif a=='annotations':
						self.layout['annotations']={'values':[],'params':{}}
					else:
						del reduce(dict.get, path[a],self.__dict__)[a]
				except:
					raise Exception('Key: {0} not found'.format(a))