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now that cross-package deps are tracked correctly.

We no longer use dummy-ghc; instead we don't configure most packages
until the stage1 compiler is available.
  
We also now use Cabal for building the ghc-bin package.

There are a couple more sanity checks too.

cygwin's /bin/install doesn't set file modes correctly if the
destination path is a C: style path:

$ /bin/install -c -m 644 foo /cygdrive/c/cygwin/home/ian/foo2
$ /bin/install -c -m 644 foo c:/cygwin/home/ian/foo3
$ ls -l foo*
-rw-r--r-- 1 ian None 0 2011-01-06 18:28 foo
-rw-r--r-- 1 ian None 0 2011-01-06 18:29 foo2
-rwxrwxrwx 1 ian None 0 2011-01-06 18:29 foo3

This causes problems for bindisttest/checkBinaries.sh which then
thinks that e.g. the userguide HTML files are binaries.

We therefore use a /cygdrive path if we are on cygwin

rather then the bootstrapping compiler. This fixes problems where the
bootstrapping compiler dynamically links against libraries not on the
target machine.

We were generating PrimopWrappers.hs twice in two different places,
one for the normal build and one for Haddock (I think).  Unfortunately
one of these was causing extra rebuilding, because the file dropped
into the dist-install/build/autogen directory, where it was picked up
by the automatic HS_SRCS detection in subsequent make runs.  This was
exposed by a recent change to HS_SRCS:

  Wed Oct 20 11:47:59 BST 2010  Ian Lynagh <igloo@earth.li>
    * Look for sources in Cabal's autogen directory too

This should fix the stage3 failures in the build bots.

You can't use TH with a profiling compiler.

Stops us accidentally depending on them

For now we don't build the Cabal userguide, but we should add markdown
support so that we can do so.

This is a follow-on to Simon's patch yesterday, developed
with him.  It cleans up the computation of how packages
are installed, and installs the right ones.

DPH is now using the public vector package instead of its internal
version.

vector and primitive are not "boot" packages; they aren't required to
build GHC, but they are required to validate (because we include DPH
when validating).

If you say './darcs-all get --no-dph' then you don't get DPH, vector,
or primitive.

Instead of the ghc-stage and ghc-stage2-package files in a package, we
now have a list of these in ghc.mk.  There are other similar lists (of
boot-packages and non-installable packages), so this is not too bad,
and is simpler.

While poking around in the top-level ghc.mk file I spotted various
opportunities to clean up and re-order some of the cruft that has
accumulated over time.

saying

  make TRACE=1

prints most of the macro calls and their arguments.  It's easy to
trace new macros; see rules/trace.mk.

rather than being repeated in the build system

It's not just when cleaning!

Stops the docs going out of sync with the code.

We need to include the DPH cleaning rules, even though we don't build DPH
when GhcProfiled = YES.

Reason: DPH uses Template Haskell and TH doesn't work 
in a profiled compiler

Revert this patch:
    Matthias Kilian <kili@outback.escape.de>**20090920181319
    Don't build haddock if HADDOC_DOCS = NO, and disable HADDOC_DOCS
        if GhcWithInterpreter = NO
    Haddock uses TcRnDriver.tcRnGetInfo, which is only available if
    GHCI is built. Set HADDOC_DOCS to NO if GhcWithInterpreter is NO,
    and disable the haddock build if HADDOC_DOCS = NO.