Incremental cleanups & improvements to the I/O subsystem

- Initial fix for problems caused by partial writes
  to non-blocking file descriptors.  To see this bug,
  run ghc/tests/programs/life_space_leak through a pipe.

- remove FILEOBJ_FLUSH, it allegedly has the same meaning
  as FILEOBJ_WRITE.  This fixes a buf in openFd: it erroneously didn't
  set FILEOBJ_FLUSH on writeable file descriptors.

- some ANSIfication

import wibble for hugs

Remove debugging printf in findQualifier().

HUGS_VERSION ++

Change STDCALL to STDKALL to avoid conflict with a header file.

Simon's driver changes (should have committed these a while back)

* Add -no-rules to first simplifier pass

* Move CSE pass

Missing dollar on USER_WAY_NAMES and OPTS

Add a comment

Express sequence in terms of foldr

Better error message when trying to derive classes for
existentially-quantified data constructors.

And a general slight tidy up in TcDeriv

Slight wibble on polytype syntax, going in the direction of allowing
for-alls in more places.  This one lets you say
	forall a. forall b. a->b

Report decent error for top-level defn of a qualified name

Add documentation on pattern guards

Don't guess where the installation directory is.  Instead,
read it from the STGHUGSDIR env var at startup.

Disable debug printing in setDefaultLibDir.

Add clean target, and change hugslib to all.

Fix bug in threadDelay, where the delay ticks could end up negative.

Fixing setDefaultLibDir to work with relative use of hugs binary.

Adding method for packaging up binary distribution of Hugs.

wibble

- remove -dcore-lint
- add Happy-generated files to MAINTAINER_CLEAN
- replace $(GHC_DRIVER_DIR)/ghc with $(GHC)

Fixes to allow compilation under cygwin and Win32.

Bind namePmFromInteger, namePmSubtract, namePmLe to stuff in Prelude
so that n+k patterns work.

Fixing incorrect definition of BlockBuffering in Hugs.

Changing the top level evaluator so it runs things
of type IO a, not just IO <monomorphic-thing>.

wibble

ANSIfication

oops, committed wrong file

ANSIfication

Use %Z instead of %z for timezone (%z is GNU extension to strftime)

failure to commit important files is a jumping-out-of-the-window offence

Updating dll export function list to include
new functions in nHandle.c

Add test for top-level qualified defns

Print module names un-encoded in user style

Add documentation about separate compilation

Fix typo in exitWith.

wibble

Update version number.

Zap irrelevant ifdefs.

cgAlts(): Don't test constructor tag if the scrutinee is known
to come from a product (single-constructor) type.