Changes to make the Prelude comply with Haskell 98.

I claim that this completes GHC's implementation of Haskell 98 (at
least feature-wise, but there's bound to be some bugs lurking..)

Minor Makefile mods.

Assorted minor Haskell 98 changes:

  * Maximal munch rule for "--" comments
  * _ as lower-case letter, "_" is a reserved id. Prefixing unused
    variable names in patterns with '_' causes the renamer not to
    report such names as being unused.
  * allow empty decls
  * comprehensions are now list comprehensions, not monadic.
  * use Monad.fail to signal pattern matching errors within
    do expressions.
  * remove record punning.
  * empty contexts are now legal  (go wild!)
  * allow records with no fields
  * allow newtypes with a labelled field
  * default default is now (Integer, Double)
  * turn off defaulting mechanism for args & res to a _ccall_.
  * allow LHSs of the form  (a -.- b) x = ...
  * Main.main can now have type (IO a)
  * nuked Void (and its use in the compiler sources.)
  * deriving machinery for Enum now also generate 'succ' and 'pred'
    method bindings.

x86: only add -fomit-frame-pointer when compiling .hc files.  It gets
in the way of debugging for normal .c files.

- compile Happy with -O by default.

Arrange for Makefile dependencies to be generated on misc
parser/ helper code.

Remove a couple of non-existent closure types.

Added indexFS,

   indexFS :: FastString -> Int -> Char

Oops, stack check in PAP_entry was *completely* wrong.  Time for a
stack check audit.

- fix stack check in PAP_entry.

Changed expected output to match new reality.

When -DDEBUG, in BYTE_ARR_CTS, allow GET_INFO(a) to be
&MUT_ARR_WORDS_info as well as &ARR_WORDS_info.

- check failed_to_evac in scavenge_static.  We might have a static
  indirection (i.e. a CAF) that we can't evacuate to the oldest generation,
  so we have to put it back on the old generation mutable list.

With this change, a bootstrapped compiler now compiles the libraries
successfully.

- Don't forget to set failed_to_evac when evacuating a THUNK_SELECTOR
- Fix GC counting

Changed expected output to reflect new reality.

Added a generational garbage collector.

The collector is reliable but fairly untuned as yet.  It works with an
arbitrary number of generations: use +RTS -G<gens> to change the
number of generations used (default 2).

Stats: +RTS -Sstderr is quite useful, but to really see what's going
on compile the RTS with -DDEBUG and use +RTS -D32.

ARR_PTRS removed - it wasn't used anywhere.

Sanity checking improved:
	- free blocks are now spammed when sanity checking is turned on
	- a check for leaking blocks is performed after each GC.

Code generated by implementTagToCon() gives a useful error message
in case of invalid arguments.

testing

Z-encodings for '/' and '.' were both 'Zd'.  Change '.' to 'Zs'.

Added check target.

Made FILE_OBJECT be defined for -D__HUGS__.
Changed .dll file refs to .so for -D__HUGS__.

Created a Makefile for fptools/ghc/interpreter.

Disabled nonblocking IO (the +128 for file flags) until missing prims
are implemented.

Removed extraneous test following 'if ( fo->flags & FILEOBJ_NONBLOCKING_IO )'

Fixed caching bug in FPTOOLS_END_{TEXT,DATA}_SECTION.

Added new option -f, which forces the creation of 'todir' if it doesn't
already exist.

Added definition of WithGhcHcVersion (but left commented out, as it's currently
unused.)

mkdependHS: for "source" imports of the form, e.g.,

   import {-# SOURCE #-} Foo

emit dependency on Foo.hi-boot-<iface-file-version-number>
rather than just Foo.hi-boot if the former exists.

Generate static closures with float/double fields properly.

Fix endianness problems in info table generation.

Added -fno-asm-mangling.

Add missing <p>

Doc changes for revised exception interface.

Add missing export of warnPprTrace (for WARN macro).

Fix RnEnv.mkPrintUnqualFn

Revised interface to the exception library.  Docs to follow.

this file is NON_POSIX_SOURCE, since we use lstat.

#include <unistd.h> to get prototype for vfork.

Add missing pattern to tidyNote.

Small changes to make the compiler boot itself