[nem-en] Debugging macros again

[vc]

> Did you try the feature of generating the source code of generated
> method as a side-effect of generation?
> I usually just inspect the generated code with .NET inspector when it
> doesn't work as I expected.

1. At this time Reflector fail on many Nemerle code.
2. No way for debugging, but if we use macro for generate really complicated
code we is blind! :(

We talk about generating fake code for macros generated AST. Maybe time to
return to this problem?