skip non-buildable executables when preprocessing, building and
  installing (as we do for libraries).

  add flags arguments to post-hooks, and have defaultUserHooks use postConf
  instead of preConf.

  changes to package description fields, as discussed on the libraries list:
  
  * allow both License and License-File, which now correspond to different
    fields of Package Description.
  
  * add Synopsis.
  
  * rename Hidden-Modules as Other-Modules.

Very simple, backward-compatible change.  Not sure how this never
happened before, it would be a shame to have worked on the
preprocessor interface and not exposed it to users at all.

Took this chance to move the test preprocessor out of the
PreProcessors module and into a test case.

  Now the only dangling links are in System.Directory, referring to the
  hidden module GHC.IOBase for constructors of IOException.

On a whim (and since I randomly ran into Thomas Hallgren on the train
today) I added support for Programatica, via pfesetup.  It doesn't
probably do quite what one would want it to do since it preprocesses
everything and slaps it into dist/tmp, but it may be interesting
nonetheless, and we can clean it up later if anyone thinks we should
keep it around.

It was very easy to add and looks a lot like the haddock command.  Try
it with ./setup pfe.  It doesn't do anything too interesting to the
cabal sources yet since it can't find a bunch of modules.  It would be
great if someone added all the fptools modules to it :)

  Move buildable, cc-options, ld-options, frameworks and hidden-modules
  fields into BuildInfo, so they can be overridden with local info.
  As a consequence executable-modules is replaced with hidden-modules.
  Perhaps other-modules would be a better name.

  No longer expect a name field at the head of the library stanza --
  it's redundant, and the pretty printer can't produce it.

  Another way to manage the mapping of component names to BuildInfo's
  would be to use the filesystem, i.e. look for <package>.buildinfo,
  <exename1>.buildinfo, <exename2>.buildinfo, etc, each parsing as a
  single BuildInfo.

  Change the postHook types

  Query system for "c:\Program Files"

  Add shell32 to extra-libs under Windows. It is required because
  SHGetFolderPath is called from Distribution.Simple.Configure now.
  

cvs pull from ross: ppCpp now uses the cpphs specified to configure, and is also passed os/arch defines.

User hooks look like this now:
     preConf  :: Args -> ConfigFlags -> IO HookedBuildInfo,
     postConf :: IO ExitCode,

type HookedBuildInfo = (Maybe BuildInfo, [(String, BuildInfo)])

this means that only stuff in BuildInfo can be overridden.  A
buildinfo file now looks like this:

name: libraryname
include-dirs: /foo/bar, /bang/baz
extensions: CPP

executable: executablename
extensions: TemplateHaskell

 add options to configure for specifying paths of preprocessors
 (happy, alex, hsc2hs and cpphs), e.g. --with-happy=/bin/veryhappy

  buildHugs: add name_{HOST,TARGET}_{OS,ARCH} defines to cpp command line.