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ghc still works, also the module was tested in hugs and ghc

Push this further along, and fix build problems in the first patch.

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.

GC some dead code.  In some places, I left useful-looking but
currently unused definitions in place, surrounded by #ifdef UNUSED
... #endif.

Make this compile with 4.08.

Fixed imports for GHC >= 5.03

Split out FastMutInt separately