- Rename Compat.* modules to Distribution.Compat.*
- Add {-# OPTIONS -cpp #-} to a few modules
- Distribution.Compat.ReadP: use real ReadP in GHC 6.3+
- new module: Distribution.Extension, contains Extension type
  formerly from Distribution.Misc.
- new module: Distribution.License, contains License type
  formerly from Distribution.Misc.
- remove Distribution.Misc
- new module: Distribution.ParseUtils, containing various parsing utilities
  formerly from Distribution.Package, that are re-used in 
  Distribution.InstalledPackageInfo.
- new module: Distribution.PackageDescription contains everything related
  to PackageDescription, which was formerly in Distribution.Package.
- Distribution.Package now contains only PackageId-related stuff.
- Distribution.InstalledPackageInfo: update for use in GHC, add
  parsing/pretty-printing.
- Compat.H98 is now Distribution.Compat.Error (it contained only stuff
  related to the Error monad, which isn't H98 anyway).
- remove imports of H98 libs (use hierarchical ones instead)
- configure now detects the GHC version (but doesn't do anything with it... yet)

this allows cabal to be compiled for hugs.

lots of work to do here still.  cabal can't yet bootstrap because of
the necessit of CPP options pragmas at the top of the files.  See
TODO list for stuff to do for Hugs.

If the package file isn't readable during build, don't pass the
-package-conf flag to GHC.  If it doesn't exist during register, and
the --user flag was passed create it.  If it's not writeable, and the
--user flag was passed, then we exit with error.

This should fix debian bug# 278667

Utils used to depend on Distribution.Package, so Package couldn't
easily use Utils.  I removed this dependency by moving a couple of
functions into D.Package, then moved currentDir into Utils where it
belongs.