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ifBuildable only runs a command it is given if the library in . either
must be built (core-package - readline) or is buildable.

It used to be the case that
    autoreconf
in the root would also autoreconf in any libraries that need it, and
    ./configure
in the root would also configure all the libraries.

However, cabal now configures the libraries, so they were getting
configured twice.

Thus now a small shellscript, boot, autoreconfs the root and all libraries
that need it, and ./configure in the root doesn't configure the libraries.

* configure can be told where ld is
* make an hsc2hs-inplace.bat
* tell Setup configure about foo.bar rather than foo on Windows
* tell Setup configure to pass a --with-cc=$(CC) argument to ./configure

(we don't actually do anything useful either, because Cabal doesn't have
an install-docs option).

They aren't built as part of a GHC build anyway, it doesn't make much
sense to include them in checkouts or source tarballs.

The following packages are now "core" packages:

  base, Cabal, haskell98, readline, regex-base, regex-compat
  regex-posix, stm, template-haskell, unix, Win32

Core packages are those packages required to bootstrap GHC, or are
closely tied to GHC (stm, template-haskell).  These are the packages
that will be provided in a source distribution from now on.

All other packages are classified as "extra" packages.  As far as
binary distributions and nightly builds go, nothing will change -
we'll still build and include all these packages in the distributions.

NOTE: 'sh darcs-all get' will now get the core packages only.  To get
the extra packages too, use 'sh darcs-all --extra get'.

This may help with entering non-ASCII characters at the GHCi prompt,
but as usual with Unicode there's no simple solution that just works.
See commentary in InteractiveUI.hs for more details.

when setting up SUBDIRS.

Most of the other users of the fptools build system have migrated to
Cabal, and with the move to darcs we can now flatten the source tree
without losing history, so here goes.

The main change is that the ghc/ subdir is gone, and most of what it
contained is now at the top level.  The build system now makes no
pretense at being multi-project, it is just the GHC build system.

No doubt this will break many things, and there will be a period of
instability while we fix the dependencies.  A straightforward build
should work, but I haven't yet fixed binary/source distributions.
Changes to the Building Guide will follow, too.