Not needed since cabal-install moved to another repo.

Since we can and we want to set a good example.

We currently have 39 different authors, all those with a significant number
of patches are listed as copyright holders in the LICENSE file.

Joint work with Thomas Schilling.
The sections and indeed fields (and if/else) can now use either explicit
brace {} style layout or indentation eg:
> library
>   exposed-modules: Blah
or
> library {
>   exposed-modules:
> }
layout style can be nested within explict braces style and vica versa.
Also add some more checks and relax the tab checks.
Unrecognised sections, like unrecognised fields, are not fatal errors,
so we could add sections in future without breaking old cabal.

Ok to remove, it never appeared in any release.

Thanks to int-e for reporting

and remove makefile --ghc-option flag as it's not used (as far as I can see).
It works generically by updating the ProgramConfiguration rather than the
previous ad-hoc implementation. This feature is generally only useful for
hackers who want to pass extra args to a progam during the build step
(probably as a one-off) without having to reconfigure.

It was just a hack for the benefit of ghc and we don't need it now.

amd --prog-arg to --prog-arg and update the user guide.

For consitency with other flags.

For consitency with other flags.

in the same order as they were passed to cabal configure on the command line

So this provides two ways of passing options that contain embeded spaces:
--foo-args='--bar --baz="path with spaces in"'
--foo-arg=--bar --foo-arg=--baz="path with spaces in"
all args passed this way are collected in order.

It's now part of the build information rather than package description,
which is as it should be.

And fill out the includeDirs, extraLibs, extraLibDirs, ccOptions and ldOptions
with the results from pkg-config --cflags --libs

configure now has to gather the required build tools from the BuildInfo
of the lib and exes.

The 'BuildInfo' for the library (if there is one and it's buildable)
and all the buildable executables. Useful for gathering dependencies.

PackageDB can be user/global or a specific package db. The latter option is
not exposed in the user interface anywhere.
Also move the getInstalledPackages into the per-compiler modules with a
non-compiler-specific wrapper left in Distribution.Simple.Configure

Don't confuse users by suggesting that we're installing libs when we're
actually only installing exes, or vica-versa.

Since when we run c2hs we put .chi files into dist/build so that's also
where we should be looking for them.

Make Haskell part of the default $prefix and make docs relative
to $prefix rather than $datadir which is fixed for libs.
Make the default fixed lib $datadir be Program Files\Haskell rather
than Common Files.

Redirect stderr to /dev/null (or NUL on windows) and throw an exception
like rawSystemExit does rather than calling die which prints an unhelpful
message before throwing an exception. It's not an overall failure to not
be able to establish the version of a program, since we check later if we
actually have any requirement for any particular version anyway.
So for example this makes running configure with an old version of c2hs
that doesn't grok --numeric-version not produce unhelpful output that
make people think that configure failed.