Fully qualified name of NamedTuple types

[mdcfrancis]

#9

@davidanthoff wrote - One thing that this PR changes and that broke my stuff is that make_tuples now returns an expression that can't just be evaluated in the current module because the named tuple is now always defined in the NamedTuples module. It might be nice if the expression returned by make_tuples actually included the fully qualified name of the type, i.e. including the module name NamedTuples. But from my side you can merge right now.