[Hat] Data.Generics missing from Hat

[Malcolm Wallace]

> Data.Generics appears to not be translated
> 
> As to why it isn't translated, I don't know, but I expect Malcolm had  
> a good reason and will tell you later :)

Data.Generics is a library used behind-the-scenes to implement a
language extension.  Apart from using quite a number of non-portable
extensions itself (and thus difficult to translate), it would only
really be useful to have this library available if hat-trans could
also understand the new syntax of generics (polytypic code).

Hat currently supports only a few minor extensions to Haskell'98,
namely FFI, hierarchical namespace, MPTC, functional dependencies,
and existentials.

Regards,
    Malcolm