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This fixes the unused imports warning when
    Foo (F(x,y,z))
is imported and
    Foo (F(..))
is exported.

This patch, joint work between and Ian and Simon, fixes Trac #1074
by reporting unused import declarations much more accuratly than 
before.  The specification is described at 

http://hackage.haskell.org/trac/ghc/wiki/Commentary/Compiler/UnusedImports

The implementation is both easier to understand than before, and shorter
too.  

Also fixed are #1148, #2267

Also fixed is -ddump-minimal imports, which now works properly, fixing 
Trac #1792.

We cache the old versions of files generated by configure, so that if
configure touches the file without changing it, we can detect that and
restore the timestamp.

The build system should use 'find' and 'sort' that are discovered by
configure, not the ones in your path.  On Windows the ones in your path
might well be the non-Unixy Windows versions.

This patch fixes the ones I tripped over. There may be more.

And add links to the new shared libs section.

Basically just stat that it exists and refer to the ghc dev wiki
for the details, because we don't really want people using it.

e.g.

  cd compiler
  make FAST=YES stage1/build/HscTypes.o

builds just the specified .o file, without rebuilding dependencies,
and omitting some of the makefile phases.  FAST=YES works anywhere, to
omit depenencies and phases.  'make fast' is shorthand for 'make
all FAST=YES'.

The type in a ViewPat wasn't being zonked.  Easily fixed.

The main purpose of this patch is to fix Trac #3306, by fleshing out the
syntax for GADT-style record declraations so that you have a context in 
the type.  The new form is
   data T a where
     MkT :: forall a. Eq a => { x,y :: !a } -> T a
See discussion on the Trac ticket.

The old form is still allowed, but give a deprecation warning.

When we remove the old form we'll also get rid of the one reduce/reduce
error in the grammar. Hurrah!

While I was at it, I failed as usual to resist the temptation to do lots of
refactoring.  The parsing of data/type declarations is now much simpler and
more uniform.  Less code, less chance of errors, and more functionality.
Took longer than I planned, though.

ConDecl has record syntax, but it was not being used consistently, so I
pushed that through the compiler.

$ ./inplace/bin/ghc-stage2 --interactive
GHCi, version 6.11.20090701: http://www.haskell.org/ghc/  :? for help
ghc-stage2: GHCi cannot be used when compiled with -prof
[1]    32473 exit 1     ./inplace/bin/ghc-stage2 --interactive

Building a profiled GHC is as simple as adding

GhcLibWays += p
GhcProfiled = YES

to your build.mk and saying 'make'.  Then you have a profiled
inplace/bin/ghc-stage2.

 - converting a THSyn FFI declaration to HsDecl was broken; fixed
 - pretty-printing of FFI declarations was variously bogus; fixed
 - there was an unused "library" field in CImport; removed

I boobed when I decoupled record selectors from their data types.
The most straightforward and robust fix means attaching the TyCon
of a record selector to its IfaceIdInfo, so 

   you'll need to rebuild all .hi files

That said, the fix is easy.