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.

  Remove -v option from globalOptions
  Use parseNoArgs in parseBuildArgs
  Add -v option to ghc and ar when the build
   process is executed with verbose > 4

Fixed non-exhaustive pattern in parser (error for missing main-is field)
Slight refactoring to read a file with any given parser
Added readBuildInfo and friends (probably not quite what we want,
since no name attached)

if ./setup haddock is run w/ verbosity > 4, it adds -v to haddock command

added title to ./setup haddock
added prolog to ./setup haddock
all commands take the --verbose argument, so fixed the parser
uncommented hooks stuff I hid for the 0.4 release