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As suggested by Hamish Mackenzie

It now works with Extensions rather than KnownExtensions

The knownExtensions list had already got out of sync with the datatype.
Now we use an Enum instance to get the list of constructors.
Also, having the actual extensions in a separate type than UnknownExtension
and EnableExtension makes it easier to add extension disabling support
later.

Part of GHC trac #3968.

Resolves ticket #344.

Concrete XML syntax is used in the Haskell Server Pages extension 
language, and a description can be found in the paper "Haskell Server 
Pages through Dynamic Loading" by Niklas Broberg, published in Haskell 
Workshop '05.

Regular expression pattern matching is described in the paper "Regular 
Expression Patterns" by Niklas Broberg, Andreas Farre and Josef 
Svenningsson, published in ICFP '04.

Along with possibly another extension that replaces it.

Use cabal-devel@haskell.org as the maintainer in most cases except for
a few which were pre-existing modules copied from elsewhere or modules
like L.H.Extension which really belong to libraries@haskell.org
Remove the useless stability module. We have more detailed information
on stability elsewhere (in the version number and user guide).
Add more top level module documentation, taken from the source guide.

The parse function is ~15x faster than using reads by using a simple
hash table :: Array Char [(String, Extension)]. The hash function is
then just 'head' -- the first letter of the extension name.

Seems to be based on GHC's -fcontext-stack flag, which takes an integer
argument.

As far as I can tell
(a) The -finline-phase flag stopped actually being accepted by GHC
    sometime between GHC 4.08.2 and GHC 5.04.3
(b) It took an Int argument

  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