** The value of --copy-prefix is now prepended to that of --prefix
(like $DESTDIR) instead of replacing it.  As Ross pointed out, it
doesn't really make sense for --prefix not to be a prefix of
--copy-prefix, as the value of --prefix may be embedded in the
generated files.

** Unit tests change to reflect

** add a newline to the end of the installed package description
** When pretty-printing free-format text fields, align the lines vertically
  (so that following lines will be seen as continuations) and replace empty
  lines with "." (so they'll be correctly re-parsed, instead of looking
  like a stanza separator).

First cut at installHugs.  The treatment of executables is still incomplete.
simplistic register/unregister for Hugs:
  
  * register copies the installed package decsription into the packages dir
  
  * unregister uninstalls the package
Hugs supports FFI without extra flags

** revert to getting main module from the right place
** make singleStanza ignore comment lines too

** haddock fixes

** Add the following fields to PackageDescription:
  
  	buildPackage   :: Bool,         -- ^ package is buildable here
  	ccOptions      :: [String],     -- ^ options for C compiler
  	ldOptions      :: [String],     -- ^ options for linker
  	frameworks     :: [String],
  
  When these are system dependent (as they often are), they will need to be
  overridden, but the mechanism is left to the Cabal user.
  
  Not that I've treated these as basic fields, so they apply to the library
  (if any) and all executables in the package.  The overriding is easier
  that way.

** Make the build prefix settable with the --builddir option to configure
  (in Simple), save this in the LocalBuildInfo, and use it in subsequent
  phases.
  
  This is useful for the Hugs build, where we want to place the built
  libraries so that we can easily use them inplace.

** Some rearrangement, centring on changes to the definition of
  PPSuffixHandler:
  
  * removed the special treatment of literate source: a separate
    preprocessor can be used for these if required.
  
  * handlers can use package and local build info to construct the
    appropriate preprocessor.
  
  Also, the supplied suffix handlers list now only has entries for suffixes
  that need preprocessing (i.e. not .hs or .lhs).  Dummy entries for the
  suffixes handled by the compiler are added internally.

**  Add a function getOptionsFromSource to fetch LANGUAGE and OPTIONS pragmas
  from the initial part of a Haskell source module (as proposed by SimonM
  on the libraries list).
  
  Also export the auxiliary function stripComments, which does what it says,
  optionally preserving pragmas.

** Previously, "hidden-modules" had nothing to do with what gets
   built, and we had to compute "exposed-modules" with "modules `setdiff`
   hidden modules".  At Ross Paterson's suggestion, I added
   Exposed-Modules.

** Since the executable sections also used the "modules" field, I
   changed it to use "executable-modules", and got rid of the
   ambiguous "modules" field.  This should hopefully be more clear to
   everyone.