[nem-en] Debugging macros again

[NoiseEHC]

>
> AST of expansion can be seen only in VS and only if code succeeds with
> compilation. I don't think that showing AST of code, which triggered
> error is a good default, though it is a nice idea if user could enable
> it in "verbose mode". So the hint from previous point could be
> assisted by AST of offending code.
>
This AST output is for debugging macros and not for showing errors. What 
I thought that
you have no way verifying whether your very advanced macro did what you 
intended...