Improve generation of 'duplicate import' warnings.
This involved changing (actually simplifying) the
definition of RdrName.ImportSpec.

I'm not sure whether this one merits merging or not.
Perhaps worth a try.

Fix the test for duplicate local bindings, so that it works with
Template Haskell.  Pre-TH, all the local bindings came into scope
at once, but with TH they come into scope in groups, and we must
check for conflict with existing local bindings.

	MERGE TO STABLE

Add a couple more lint tests

MO_S_Conv folding: fold floating-point literals properly

permit mingw_* vars to be overridden; merge to STABLE

re-use prep-bin-dist-mingw by exec'ing it. Merge to STABLE

In the :i command for ghci, load the interface files for
the home module of every in-scope type or class. That way
we are sure to see all their instance declarations.

	MERGE TO STABLE branch

Nuke bogus warnings in deriving; MERGE TO STABLE

More Mac OS X Tiger / GCC 4.0 fixes.

MERGE TO STABLE

Wibbles to new hs-boot instance story

Better kind error reporting; MERGE TO STABLE

Mac OS X (Tiger): Fix the Mangler for (Apple's version of) GCC 4.0

MERGE TO STABLE

BINDIST_DOC_WAYS: permit variable to be overridden (in a mk/build.mk, perhaps); merge to STABLE

leave out Java bits in include/ that mingw-3.2 supplies; temporarily disable PDF document generation

gcc-mingw-3.4.x seems to have renamed .rodata to .rdata; look for either

'ghcprof' is a perl script, but installed in the bin/ directory. Merge to STABLE

The boot dfunid should be a LocalId

(from 1.4.6.1 on 6-4-branch)

Fix some incorrect use of int/nat that breaks x86_64

Small fixes that adds chm and HxS targets to the build system. The former is used
to build all documentation in HtmlHelp format while the letter uses HtmlHelp2 format.

Fix typo causing loop in SpecConstr!

XML wibble

Document improvements in overlap handling

Re-instate support for environment variable expansion and the -D flag.
Now it is done pre-parsing, however.

Strip wired-in names from interface files

Further stage-2 wibbles

Missing import

A couple of hs-boot files

Further wibbles to the new tidying plumbing

StgFunInfoExtra_slow_apply(): convert the slow_apply_offset to a W_
before arithmetic.

Re-plumb the connections between TidyPgm and the various
code generators.  There's a new type, CgGuts, to mediate this,
which has the happy effect that ModGuts can die earlier.

The non-O route still isn't quite right, because default methods
are being lost.  I'm working on it.

calcAllocated: fix small mis-calculation in the SMP case

Small code-size optimisation: I forgot to add a specialised case for
functions with no argument words (which might happen if the function
takes a void argument, for example).

Instance for wired-in tycons wibble

This big commit does several things at once (aeroplane hacking)
which change the format of interface files.  

	So you'll need to recompile your libraries!

1. The "stupid theta" of a newtype declaration
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Retain the "stupid theta" in a newtype declaration.
For some reason this was being discarded, and putting it
back in meant changing TyCon and IfaceSyn slightly.
   

2. Overlap flags travel with the instance
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Arrange that the ability to support overlap and incoherence
is a property of the *instance declaration* rather than the
module that imports the instance decl.  This allows a library
writer to define overlapping instance decls without the
library client having to know.  

The implementation is that in an Instance we store the
overlap flag, and preseve that across interface files


3. Nuke the "instnce pool" and "rule pool"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
A major tidy-up and simplification of the way that instances
and rules are sucked in from interface files.  Up till now
an instance decl has been held in a "pool" until its "gates" 
(a set of Names) are in play, when the instance is typechecked
and added to the InstEnv in the ExternalPackageState.  
This is complicated and error-prone; it's easy to suck in 
too few (and miss an instance) or too many (and thereby be
forced to suck in its type constructors, etc).

Now, as we load an instance from an interface files, we 
put it straight in the InstEnv... but the Instance we put in
the InstEnv has some Names (the "rough-match" names) that 
can be used on lookup to say "this Instance can't match".
The detailed dfun is only read lazily, and the rough-match
thing meansn it is'nt poked on until it has a chance of
being needed.

This simply continues the successful idea for Ids, whereby
they are loaded straightaway into the TypeEnv, but their
TyThing is a lazy thunk, not poked on until the thing is looked
up.

Just the same idea applies to Rules.

On the way, I made CoreRule and Instance into full-blown records
with lots of info, with the same kind of key status as TyCon or 
DataCon or Class.  And got rid of IdCoreRule altogether.   
It's all much more solid and uniform, but it meant touching
a *lot* of modules.


4. Allow instance decls in hs-boot files
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Allowing instance decls in hs-boot files is jolly useful, becuase
in a big mutually-recursive bunch of data types, you want to give
the instances with the data type declarations.  To achieve this

* The hs-boot file makes a provisional name for the dict-fun, something
  like $fx9.

* When checking the "mother module", we check that the instance
  declarations line up (by type) and generate bindings for the 
  boot dfuns, such as
	$fx9 = $f2
  where $f2 is the dfun generated by the mother module

* In doing this I decided that it's cleaner to have DFunIds get their
  final External Name at birth.  To do that they need a stable OccName,
  so I have an integer-valued dfun-name-supply in the TcM monad.
  That keeps it simple.

This feature is hardly tested yet.


5. Tidy up tidying, and Iface file generation
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
main/TidyPgm now has two entry points:

  simpleTidyPgm is for hi-boot files, when typechecking only
  (not yet implemented), and potentially when compiling without -O.
  It ignores the bindings, and generates a nice small TypeEnv.

  optTidyPgm is the normal case: compiling with -O.  It generates a
  TypeEnv rich in IdInfo

MkIface.mkIface now only generates a ModIface.  A separate
procedure, MkIface.writeIfaceFile, writes the file out to disk.

Run each nofib program multiple times, tunable by the $(NoFibRuns)
variable.  nofib-analyse already knows how to average the times from
multiple runs.

comment wibble; switch from Italian to English spelling of 'compatible'

When using -H<size> in SMP mode, divide the total nursery size amongst
the various nurseries.  -H<size> now does something reasonable with
SMP.

Hold the sm_mutex around access to the mutable list.

The SMP RTS now seems quite stable, I've run my simple test program
with 64 threads without crashes.

fprintf(stderr,..) --> debugBelch(...)

Some extra sanity checking