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Improve hevea (.tex -> .html) rule

Default methods are sys-binders

No more vsgml.

Added hevea.

vsgml? What's that?

Removed vsgml->sgml rule: we no longer have vsgml.

Removed second copy of sgml->ps rule and added latex->html rule (for use
with HeVeA).

Nuked.  (Decided not to go this route in the end).

rename filterNameEnv-->filterNameMap to avoid clash with Name.filterNameEnv.

Fixes to new version machinery

- Bug fixes to the interpreter.  Now much more stable - it hasn't crashed
  all day.

- Many improvements to the user interface (eg. :set +t and :set +s
  work just like Hugs).

- Several wibbles & message improvements: the interpreter now informs you
  when it's loading the object code for a given module.

1. Make the new version machinery work.
   I think it does now!

2. Consequence of (1): Move the generation of
   default method names to one place (namely
   in RdrHsSyn.mkClassOpSigDM

3. Major clean up on HsDecls.TyClDecl
   These big constructors should have been records
   ages ago, and they are now.  At last.

Unused imports and suchlike

Version management

[WARNING: may not work!  Don't update till I've tested it.]

This commit is a first stab at getting version management to
work properly.  The main trick is to get consistent naming when
comparing old and new versions of the same module.  

Some functionality has moved arond between
  coreSyn/CoreTidy, which tidies up the result of
			the middle end of the compiler
	Main change: now responsible for figuring out which
	Ids are "external" (i.e visible to importing modules),
	and constructing the final IdInfo for each Id

  main/MkIface, which produces the ModIface and ModDetails
		for the module being compiled
	Main change: CoreTidy does more, so MkIface does less

  stgSyn/CoreToStg, which converts Core to STG
	Main change: responsible for globalising internal
	names when we are doing object code splitting 
			
The game plan is documented at the top of CoreTidy.

Slurp unpackCString even for interfaces

more hacking

Today's hacking; more things work, but StgInterp is rapidly heading
for a brick wall.  Fortunately we're planning to swerve at the last
minute.

Infrastructure for the (machine-independent) assembler.

:l now unloads the previously loaded module collection before loading
the new ones.  This allows you to :l Main, :cd <somewhere-else> and :l
Main again without it saying "compilation IS NOT required".

omit PrelMain from the GHCi library.

remove some duplicate showPasses.

message wibble

add stuff for building GHCi libraries automatically.

Fix problems with errors during renaming causing the PIT to get out of
whack.

typos

- :type now prints names unqualified when possible.
- :module is implemented

Don't commit junk in the Makefile :-(

compiling-with-4.08.1 wibbles

message wibbles: don't print "compilation IS required" in -v0 mode.

Bugfixes, bugfixes:

  - allow compiling expressions in the context of any module we have
    an interface for, including "Prelude".
  - don't forget to pull in things like unpackCString# in the renamer,
    we might need to use them for desugaring Strings, for example.  I'm
    sure there are other things we'll need to pull in too.
  - :quit now works from the interpreter (!)

Zonk the expr we return from typecheckExpr.

Delete pci field from PersistentCMState.  Now that the list of available
packages is a global variable (v_Packages), there's no point in having it
in PersistentCMState.

merge rev. 1.9.2.6

merge rev. 1.44.2.4

Message wibbles.

Only let the finder see the set of packages which will be available for
linking with, rather than all available packages.

Add dummy import dependency to CgExpr so that booting in batch mode works.

* :t works !!!  (but it's a bit excessive about qualifying everything
  at the moment).

* lots of other things work.

Return the correct file name for .stub_[ch] files.

Mostly verbosity changes.

GONE AWAY:  -dshow-passes, -ddump-all, -ddump-most.

NEW:
    -v<n>, where <n> is

    0	|   print errors & warnings only
    1   |   minimal verbosity: print "compiling M ... done." for each module.
    2   |   equivalent to -dshow-passes
    3   |   equivalent to existing "ghc -v"
    4   |   "ghc -v -ddump-most"
    5   |   "ghc -v -ddump-all"

4 & 5 are the same at the moment.  -dshow-passes also prints out the
passes in the driver, and some in the compilation manager.