Bug#556099: more dependencies information

[Ximin Luo <xl269@cam.ac.uk>]

Installing gitit through cabal adds 500MB of stuff to my system (300MB in
debian packages for ghc6, libghc6-*-dev, et.al., 200MB in cabal packages in
~/.cabal/). It would be nice if a debian package were made instead that only
needs runtime dependencies like pandoc and happstack.

from gitit.cabal:

  build-depends: base >=3 && < 5, parsec < 3, pretty, xhtml, containers,
                     pandoc >= 1.2, process, filepath, directory, mtl, cgi,
                     network, old-time, highlighting-kate, bytestring,
                     utf8-string, SHA > 1, HTTP, HStringTemplate, random,
                     network >= 2.1.0.0, recaptcha >= 0.1, filestore >= 0.3.3,
                     datetime, zlib, url, happstack-server >= 0.3.3 && < 0.5,
                     happstack-util >= 0.3.2 && < 0.5, xml >= 1.3.4,
                     hslogger >= 1 && < 1.1, ConfigFile >= 1, feed >= 0.3.6,
                     cautious-file >= 0.1.5 && < 0.2, texmath

(Additionally, I needed libpcre3-dev for cabal to install gitit correctly;
maybe libpcre3 is needed as a runtime dependency too.)

There seem to be debian packages for happstack (and a load of other haskell
packages) here:

http://deb.seereason.com/debian/pool/main/h/

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