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This unnecessary ambiguity has been there for ages, and is now rejected
by -Werror, after fixing #3261

This is not a bug fix, it just makes better use of memory

Makes GADT syntax consistent by allowing multiple constructors
to be given a single signature
   data T wehre
       A, B :: T
       C :: Int -> t

See Trac #2953. This patch implements a distinct flag for each extended
class that may be automatically derived.  And I updated the user manual
to reflect the fact that we can now derive Functor, Foldable, Traversable.

 * The old Reg type is now split into VirtualReg and RealReg.
 * For the graph coloring allocator, the type of the register graph
   is now (Graph VirtualReg RegClass RealReg), which shows that it colors
   in nodes representing virtual regs with colors representing real regs.
   (as was intended)  
 * RealReg contains two contructors, RealRegSingle and RealRegPair,
   where RealRegPair is used to represent a SPARC double reg 
   constructed from two single precision FP regs. 
 * On SPARC we can now allocate double regs into an arbitrary register
   pair, instead of reserving some reg ranges to only hold float/double values. 

This patch arranges to gather the variables used by 'deriving' clauses,
so that unused bindings are correctly reported.

At last!  Trac #1476 and #3177

This patch extends Template Haskell by allowing splices in
types.  For example

  f :: Int -> $(burble 3)

A type splice should work anywhere a type is expected.  This feature
has been long requested, and quite a while ago I'd re-engineered the
type checker to make it easier, but had never got around to finishing
the job.  With luck, this does it.

There's a ToDo in the HsSpliceTy case of RnTypes.rnHsType, where I
am not dealing properly with the used variables; but that's awaiting
the refactoring of the way we report unused names.

When you have a (\s::String -> ....[| s |]....), the string 
's' is lifted.  We used to get a chain of single-character 
Cons nodes, correct but lots and lots of code.  

This patch arranges to optimise that to a string literal. It does
so in two places:
  a) In TcExpr, if we know that s::String, we generate liftString directly
  b) In DsMeta, if we find a list of character literals, we convert to
     a string.  This catches a few cases that (a) does not

There an accompanying  patch in the template-haskell package, 
adding Language.Haskell.TH.Syntax.liftString

We were looking at HADDOCK_DOCS instead of $$(HADDOCK_DOCS)

We were removing ".$(ProjectPatchLevel)" from anywhere in the file.
However, it included absolute paths, so if you untar a source
tarball into its default directory name, e.g.
"6.11.$(ProjectPatchLevel)", then the sed would break the paths.

We now also need to cast the values to (unsigned long), as on some
platforms sizeof returns (unsigned int).