The `not` keyword

Property definitions

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

src/parser/parser_nodes.nit:2761,2--2762,40

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

src/parser/parser_prod.nit:7163,2--7167,4