a) Fix black hole bug when doing -dshow-rn-trace
   (Involved reorganising where fixity exports are dealt with
    in RnNames/RnIfaces.)

b) Arrange to apply Lint to imported unfoldings when -dcore-lint

c) Add -fwarn-type-defaults to report use of the defaulting rules for types

d) Make it so that f (error "help) --> error "help", if f is strict
   (Changes in Simplify.lhs.)

- relax the restriction that just the one open writeable handle on
  *the same file* may exist when dealing with the standard handles,
  stdout and stderr.

  Reason: the following invocation of a Haskell program,

      foo >log 2>&1

  should be acceptable.

Don't go into an infinite loop for errors generated by hPutStr when
outputing an error message.  Use writeErrString__ to output all errors
(this won't generate a Haskell exception).

Oops, import occNameUserString.

Fix a few occNameStrings that should be occNameUserString.

- include mingw32 in the list of x86 platforms supported.
- weed out ecoff debug information.

Drop uneccessary uses of lit-lits and primops

Document memoisation library.

Preliminary results of the merge of STG hugs and 990121.  These files
will compile and link, but don't work yet.

Renamed stg.h to backend.h.

Changed file organisation of STGhugs to be more like that of
MPJ's 990121 (Hugs98 beta) release, making these files redundant.

Add memo table library.

Increase PrelPack stack size.

Fix accidental defaulting to Integer in magnitude.

Fix GC stats printing.

Be more MBLOCK-friendly when allocating and resizing stacks.  This
should reduce the memory footprint a bit.

boundsOfByteArray --> boundsOfMutableByteArray

Optimise take a little.

Fix a couple of out-of-date things.

Update new RTS options for the garbage collector.

Mention 'finalise' and 'mkWeakNoFinaliser'.

- Add ticky counter for total bytes copied during GC.
- Separate mutable list into two lists, a "mut once" list for
  old generation indirections and MUT_CONS cells, and a "mut many"
  list for mutable arrays, TSOs etc.  Objects on the "mut once" list
  will be eagerly promoted.

Remove warnings in deRefWeakzh.

- Add Weak.finalise
- Move some functions from PrelWeak to Weak.

Fix NO_FINALISER test.

Fix untested Weak changes yesterday.

- define and use *_OPTS for the various sgmltools.
- acknowledge the existence of INSTALL_LIB_SCRIPTS.

Updated and re-org'ed the library parts.

- fixed Enum.fromEnumTo{Word32} to comply with H98 once again.

- renamed boundsOfByteArray to boundsOfMutableByteArray.
  (partly for consistency, partly to create a new Top 10 entry on
   the list of long function names exported from lib/.)

- moved sizeofByteArray over to ByteArray

- Added:

     newByteArray      :: Ix ix => (ix,ix) -> ST s (ByteArray ix)
     boundsOfByteArray :: Ix ix => ByteArray ix -> (ix,ix)
     sizeofByteArray   :: Ix ix => ByteArray ix -> Int

  plus defined Eq over ByteArrays.

Moved boundsOfByteArray out into exts/

Update for specialised closures (THUNK_n_p etc.)

Print total memory in use as part of -ghc-timing output.

- Add finalise#
- deRefWeak# becomes an inline primop.

- Add finalise#
- Add mkWeakNoFinaliser
- Move deRefWeak# from an out-of-line primop to an inline one.

Report actual amount of memory in use by the compiler in the
-Rghc-timing output.

Fix two bugs in formatRealFloat.

- Increase stack size for PrelPack.lhs

Clarification about the root set and top-level objects for the
reachability property.