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Now configure looks for it as an installed program instead.

Now we have variables for whether or not to build the docbook docs as
HTML, as PS, and as PDF. The configure script output now matches what
the build system will do (except it cannot take account of any
mk/build.mk settings, of course).

Generate binary log files from the RTS containing a log of runtime
events with timestamps.  The log file can be visualised in various
ways, for investigating runtime behaviour and debugging performance
problems.  See for example the forthcoming ThreadScope viewer.

New GHC option:

  -eventlog   (link-time option) Enables event logging.

  +RTS -l     (runtime option) Generates <prog>.eventlog with
              the binary event information.

This replaces some of the tracing machinery we already had in the RTS:
e.g. +RTS -vg  for GC tracing (we should do this using the new event
logging instead).

Event logging has almost no runtime cost when it isn't enabled, though
in the future we might add more fine-grained events and this might
change; hence having a link-time option and compiling a separate
version of the RTS for event logging.  There's a small runtime cost
for enabling event-logging, for most programs it shouldn't make much
difference.

(Todo: docs)

Now ghc --info reports whether-split-objs is supported, rather than
whether the libraries were built using -split-objs.

This removes a burden from developers, and I can't remember an
occasion where it would have caught a regression.

If you manually set HSCOLOUR_SRCS=YES then the build will fail if
HsColour wasn't found.

In particular, when building dph with the stage2 compiler, we want to
register it in the main package.conf.

On Windows, we end up doing something like
    rsync c:/build/ghc-6.10.1-unknown-mingw32.tar.bz2 haskell.org:dist
and it thinks that it is meant to get the file from the host called "c".
Now we just do
    rsync ghc-6.10.1-unknown-mingw32.tar.bz2 haskell.org:dist
so rsync understand what we mean.

This should stop us ending up without HsColour'ed sources on some
platforms.

We also now tell Cabal where to find HsColour, rather than it finding
it itself.

Otherwise, if the bootstrapping compiler has a newer version, we get
a mismatch between the version used to compile ghc-prim's Setup.hs and
the version that installPackage uses.

We need to forcibly use the in-tree Cabal, or we get version mismatch errors

/a+x doesn't work on some Solaris and OS X machines. Spotted by
Christian Maeder.

Fixes making bindists on solaris. Patch from Christian Maeder.

Fix building the HEAD with itself