The `not` keyword

Property definitions

	# The `not` keyword
	var n_kwnot: TKwnot is writable, noinit

src/parser/parser_nodes.nit:2208,2--2209,40

	redef fun n_kwnot=(node)
	do
		_n_kwnot = node
		node.parent = self
	end

src/parser/parser_prod.nit:3946,2--3950,4