Simons work, mainly on the type checker

Move FAST_INT and FAST_BOOL into their own module FastTypes, replacing
the macro definitions in HsVersions.h with real definitions.  Change
most of the names in the process.

Now we don't get bogus imports of GlaExts all over the place, and
-fwarn-unused-imports is less noisy.

Simons work, mainly on the type checker

Most _RDR names are now proper Names.

The knownKeyRdrNames mapping from RdrNames to Uniques is now just a
list of knownKeyNames.

This change hasn't been propogated yet.

Julians progress

mkSrc* -> mk* (forgotten in last commit)

Rename a bunch of mkSrc* things into mk*'s.

Propagate recent changes in module/Module.lhs.

Add ModuleEnv stuff.

Changes to do with making Module and ModuleName into Uniquables.

Rationalise Module/PackageInfo/ModLocation mess.  Now we just have
Module and ModuleKind.

TLA renaming.

DynFlag plumbing.

we're now at version 4.11, at Manuel's request.  The next release will
be version 5.00 (yay!), and version 4.10 will never exist.

Do most of the DynFlags plumbing.  Also remove stuff pertaining to
search paths since the finder does all that now.

Beginnings of renamer and typechecker stuff

more progress; initial stab at calling hscMain from the driver

Summary:

  * in normal mode, the driver calls hscMain directly.  The
    compilation manager is not involved at all.  This bit is almost
    there, just waiting for hscMain to catch up.

  * in `ghc --make' mode, the driver will hand off control to the
    compilation manager, and provide the `compile' interface.  This
    bit isn't there yet.

  * in `ghc --interactive' mode, the driver will hand off control
    to the user interface (which doesn't exist yet), which will in
    turn invoke the compilation manager, which in turn invokes the
    driver again through the `compile' interface.  None of this
    is there yet.

Reinstate emptyPCS.

dead code removal

MkDependHS stuff separated into its own file.

Move @compile@-related types to HscTypes.

all compiles now; not quite hooked up to hscMain yet though.

Moving on

Renaming of various previously-TLA'd types.

getting there...

nuke all the search path cruft in this file

add macro GLOBAL_VAR()

- add prefixMatch & postfixMatch list comparison operators
- add 'global' for global vars
- remove unused cmpString
- remove unused imports

Some progress:
	- driver is split up into slightly more managable parts
	- PreProces interface for use by the summariser
	- flags stuff is taking shape

Reuben puts the "pee" into "compeelation"

Added missing </Para>. Ironic if you look at the last commit on this file.

Don't read TMPDIR from the environment under mingwin; avoids / being
turned into \ in the env var, which then causes problems when this value
is written to a shell file and then executed.

driver<->hsc deforestation continues; classifyOpts isn't needed any more

Spadework for getting ModuleName -> Module maps in the right places.
Also start to expand short names (PCS) to PersistentCompilerState, etc.

Back out changes to TcMonoType that didn't work right.

These changes are now done correctly on the before-ghci-branch,
and so will get merged in later.

Define HscLang, the output format of hsc.

Remove opt_OutputLanguage, opt_OutputFile, and a few other flags which
we're going to do through DynFlags or directly as arguments to hscLang now.

The driver, more or less verbatim copied from ghc/driver/Main.hs.

THE PLAN: the main body of the driver will eventually sit between the
compilation manager and HscMain, providing all the grotty services
like compilation of .hc files.

Some other parts of the driver, eg. flag parsing, will remain at the
front end.

Temporary file management, broken out of the driver.

Main is now HscMain: this will transform eventually into the
compiler's entry point.

CmdLineOpts now separates flags into static flags and dynamic flags;
dynamic flags will be passed around explicitly and can therefore
change from compilation to compilation.  All the dump flags and a few
language flags (like -fglasgow-exts) are currently DynFlags.

NOTE: nothing will now compile, for a long while until we get all this
connected up.  This commit is so that we start pulling in the same
direction.

export getImports; mkdependHS will need it.