RFC: style cleanup & guidelines for GHC, and related bikeshedding

[Jan Stolarek]

> And if you are changing 90% of a file for some reason, it
> probably doesn't hurt to detab it as well, etc.
I think the reason we still have tabs in the source code is that people usually don't change 90% 
of a file, but 5% or something like that and they feel this is not enough to justify detabing of 
a whole file.

Janek