For some reason github is finicky when it comes to local links. Also,
I'm dyslexic it seems when it comes to Markdown's link syntax.

* Reformat tests/README, add links to individual files.
* Add link to tests/README to HACKING.
* Add links to license files.

* Attempt to fix local links.
* Experiment with syntax highlighting.
* Add title to HACKING.
* Reword an awkward sentence and a few wordy headings.
* Change "Unix" to "Unix-like".

* Rename README files to README.md and link from root.
* Rename HACKING to HACKING.md and link from root.
* Add additional links.
* A fair amount of added punctuation and rewording.
* Replace references to darcs/trac with git/github.

Makes things a little simpler in GHC's build system if libraries are in
the same directory as their name.

At the top level we now have cabal/ and cabal-install/

  documentation updates from ross paterson
  - more accurate specification of package names
  - hs-source-dir -> hs-source-dirs in examples
  - setup clean removes a bit more
  - rearrange description of fields

  Version.hs: allow more spaces in version constraints

  Install.hs: add the exe extension when installing executables (reported by Brian Smith)
 
  test directory: add explicit dependencies on base

  Misc:
  Prefix error messages and warnings with the program name, and send them
  to stderr.  (Also moved some stuff from Distribution.Simple.Utils to
  Distribution.Simple.Build to avoid circular dependencies.)

  refactoring only: split Compiler type from Distribution.Setup,
  to reduce dependencies.

  Exclude DefaultSetup.lhs from the GHC build

  add JHC to the Compiler type

  refactored argument processing

  setup sdist --snapshot: append YYYYMMDD to the version for the bundle

  improved error messages (from Brian Smith):
  
  * attach source locations to messages when available
  
  * change some remaining error's do die.

  refactor defaultMainWorker

  split Distribution.Extension between Language.Haskell.Extension (just
  the type, which will also be useful when haskell-src-exts is merged)
  and Distribution.Compiler (mappings to compiler options).

  add Language.Haskell.Extension

  Simon marlow:  update defaults for prefix/libdir/bindir

** Wrote Setup wrapper for cabal itself, but it kinda requires
   a bootstrap makefile.
** added a bunch of targets to the makefile to do the Right Thing