Associate a set of attributes to object

Property definitions

fca $ FormalContext :: set_object_attributes
	# Associate a set of `attributes` to `object`
	fun set_object_attributes(object: O, attributes: Collection[A]) do
		for attribute in attributes do
			set_object_attribute(object, attribute)
		end
	end
lib/fca/fca.nit:89,2--94,4