Added RPM generation capability to Cabal

[Isaac Jones]

Have you seen cabal2rpm?  It's an external tool with a similar goal:

http://community.moertel.com/ss/space/Cabal2rpm/cabal2rpm.html

Similarly, there's dh_haskell for Debian packages:
http://man.cx/dh_haskell(1)

Can you outline any other differences between this command and
cabal2rpm?

This seems like really cool work, but what do folks think about adding
OS-specific items like this to Cabal.  My stance has been that we
should keep such tools external to Cabal, layered on top of Cabal so
as to not clutter Cabal too much, and to make Cabal's interface to the
outside world as good as possible.


peace,

  isaac