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Avoid loops in CCS graph.

In interface files, don't forget to mention the names of modules imported
via hi-boot files.  This is needed so that Hugs can use the import decls
in interface files to safely overestimate the dependency sets which it will
encounter when linking object code.

Allow clients of the linker library (object.[ch]) to specify, portably,
symbols they wish to ignore in calls to ocGetNames().  Use this modification
to support ignoring the multiple occurrences of ghc_cc_ID.

Don't wake up threads if the select() was interrupted by a signal.

storage.h needs to see a machine-dependant file-timestamp type for
use in Module symbol table entries -- hence this file.

update expected output

Add a few more test cases.

Disable some of the special cases in remInteger and quotInteger, which
turned out to be wrong.

Zap outdated ifdeffery.

Initial commit of major changes to module chasing and storage management:

* Total reimplementation of module chasing (see achieveTargetModules
  in hugs.c).  Build, maintain and use module dependency graphs
  to decide what needs reloading when.  The old mechanism with a
  stack of scripts, etc, is gone forever.  All the rest of these points
  are in support of the module-chasing change:

* The result of parsing a module is now a parse tree, rather than a
  half-baked parse tree and a bunch of side-effects.  Hooray!

* Redo symbol tables for Names, Tycons, Classes, Instances and
  Modules.  They are now dynamically expandable, doubling in size
  automatically when full, and use a freelist system to keep track
  of available slots.

* Allow arbitrary modules to be deleted from the system.  The
  main honcho here is nukeModule().

* Not strictly necessary, but ... unify the address space for all
  compile-time entities.  See revised whatIs().  Text is part of
  the unified address space.  This is very convenient for debugging.
  print() can now print practically anything.  Generally simplify
  storage management as much as possible, and zap the years of
  elaborate hacks needed to make Hugs work well in 16-bit systems.
  Added a load of sanity-checking support to storage.[ch].

* We don't support project files any more.  They were useful for a
  while, but no longer seem relevant.

* Nuked a large bunch of irrelevant options in rts/options.h.

As of this commit, the system can load and chase modules, both in
standalone and combined modes.  The :l (load), :a (also), :r (refresh),
:i (info), :t (show type) and :m (set eval module) commands appear
to work.  There are also several temporary limitations which will
be fixed soon:

* Anything to do with external editors, etc, doesn't work.

* The downward-closure-of-object-code (if M is object, all
  modules below M must be too) is not enforced nor checked for.
  It needs to be.

* Module M _must_ reside in M.hs/M.o (sigh).  To be fixed.

* Error handling is probably flaky, and interrupt handling
  very likely is.

* Error messages don't have line numbers.  (A 5-minute fix).

* Progress messages are all at sea; needs re-thinking now that
  the order in which things are done is radically different.

* Compile-time GC is temporarily disabled whilst I figure out how
  to stress-test the GC.

* Freed-up symbol table entries are never re-entered on the free
  lists -- a debugging measure.

* :% is given a bad type in combined mode.  To be investigated.

another -u: __init_PrelMain

Make Enum for Ratio behave like the Report says

Removed obsolete comment.

Changed __init_Main to __init_PrelMain in line with changes elsewhere.

Stopped PrelMain.dll_o being built with -split-objs (filter this out from
argument list)

What happened to gcc's "uninitialised variable" warnings when I needed
them?

not needed anymore.

wibbles

Fix up the tests in here.  Now that threadDelay is interruptible, many
of the tests for block/unblockAsyncExceptions failed because they were
relying on exceptions being blocked during a threadDelay.

Call __init_PrelMain instead of __initMain.  PrelMain lives above Main
in the dependency tree, so this is more correct.

MutableArray/STArray fixage.

Added PrelException_BlockedOnDeadMVar_static_closure and
PrelException_NonTermination_static_closure.

Made them build on mingw32 again (problems with getourtimeofday, which
shouldn't be needed under mingw anyway).

Fix several bugs in readChunk, mainly to do with copying
already-buffered data into the user buffer.

After Simon's last commit it suffices to mention libHS once (that was
exactly what I was trying in that second :-)

- add BlockedOnDeadMVar to the ever-increasing list of '-u' things
- remove accidental commit (again). sigh.

ITimer.h is really called Itimer.h. Hmmm, let's guess on what
brilliant OS this part of the RTS was developed...  :-))

Bootstrapping fix, this time for slurpFile

Adding an alternative to the "delay" system used for
threads that are waiting for time to pass.

This works on a target time basis, eliminating the
need to use the ticky style counter.

It is only enabled under:

#if defined(INTERPRETER) && !defined(HAVE_SETITIMER)

Second attack at supporting threads inside STG Hugs.
We now support most of the concurrency primitives.

Also a wibble in Evaluator.c, letting Hugs compile.

*sigh* hPutBuf{,BA} versionitis again, this time for bootstrapping 4.07

Due to PrelException_PutFullMVar_static_closure there is a circular
dependency between libHS and libHSrts, which is broken during the
linking phase by mentioning -lHS again *after* -lHSrts. Hmmm, perhaps
it would be better to mention the smaller -lHSrts twice instead? With
this patch 4.06 can build 4.07, now let's see if it bootstraps...

Re-enable soft failure while searching .hi files

Spelt HS_cbits_imp correctly in SRC_BLD_DLL_OPTS

Set WAYS=$(GhcLibWays) so that DLLs can be built.

Added PrelException_PutFullMVar_static_closure and __init_Prelude, and also
(rather hackily) __init_Main (until I find out how that should really be
dealt with).

don't export non-std stuff.

More random cleanups.

Random cleanup: rename the TSO->whatNext field to what_next, to be a
bit more consistent.

Add the readBlahOffAddr suite of primitives.  The previous method of
using indexStuffOffAddr didn't enforce proper ordering in the I/O
monad.

The indexBlahOffAddr primops may go away in the future if/when we
figure out how to make unsafePerformIO into a no-op at the back end.