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Ticket #215 (Overhaul support for packages' tests).

Ticket #215 (Overhaul support for packages' tests).  The previous output format
made it difficult to distinguish successful test suites from failed test
suites.

Ticket #215 (Overhaul support for packages' tests).  The use of the old
interface also makes it possible to log stdout and stderr without separating
the two.

Ticket #215 (Overhaul support for packages' tests).  Using a new format for the
test-suite stanza in the .cabal file, similar to the source-repository stanza.

Ticket #215 (Overhaul support for packages' tests).

Works around:
    libraries/Cabal/Distribution/Simple.hs:78:0:
        Warning: In the use of `runTests'
                 (imported from Distribution.Simple.UserHooks):
                 Deprecated: "Please use the new testing interface instead!"

Ticket #215 (Overhaul support for packages' tests). Deprecated 'runTests'
UserHook to maintain compatibility with old packages, but encourage authors to
update to the new interface.

Ticket #215 (Overhaul support for packages' tests). Log test output to a
uniquely named file in the system temporary directory. This avoids flooding the
terminal with long error messages.

Ticket #215 (Overhaul support for packages' tests).

Ticket #215 (Overhaul support for packages' tests).

Ticket #215 (Overhaul support for packages' tests). The 'test' command runs all
executable tests listed in the package description when the package is
configured with tests enabled. The exit codes and standard output/error are
collected and reported.

Ticket #215 (Overhaul support for packages' tests). Replaced generic error
message about unsupported test types with specific error messages for each
stage of the build/test process. This required changing the type of 'withTest'
to better match 'withExe' and 'withLib'.

Ticket #215 (Overhaul support for packages' tests). Check for 
duplicate testsuite name or modules during 'cabal check'.

Ticket #215 (Overhaul support for packages' tests). During 
package configuration, check for testsuites with the same name 
as other testsuites or executables.

Ticket #215 (Overhaul support for packages' tests). The
"--enable-tests" and "--disable-tests" command-line flags are
introduced, with "--disable-tests" being the default. If tests
are disabled, the testsuites are stripped from the
GenericPackageDescription during the configure stage, before
dependencies are resolved.

Ticket #215 (Overhaul support for packages' tests). Parse and
finalize a simple, dummy .cabal file containing a Test stanza.
Compare with the PackageDescription it which should result
from parsing.

Ticket #215 (Overhaul support for packages' test). During the
build stage, executable testsuites are handled analogously to
ordinary executables. This means their sources are
preprocessed and compiled. To actually compile, the build
stage actions are performed on a dummy Executable.

Ticket #215 (Overhaul support for packages' tests). Test
stanzas are parsed into the GenericPackageDescription and
PackageDescription data structures.

The problem was that we do the QA check on using the new version range
syntax after parsing. The new syntax allows ()'s but previously the
code threw them away in the parser stage. We now retain them in the
AST and deal with them appropriately. This now allows the QA check to
be accurate and detect things like "build-depends: base (>= 4.2)".

Not allowed invalid version ranges. Also check for use of new syntax.

Fixes ticket #693.

Should fix ticket #318

It is a rather silly feature and is not guaranteed to work. Having
configured and built using one set of dbs, there's no guarantee you
can register into another set. We should probably just remove it.

When giving an "internal error: unexpected package db stack" error, say
what the stack is.

This allows C files in a package to include the _stub.h files
that ghc generates. This is needed for the C code to be able
to call the C functions exported using the FFI.

This allows packages to generate .h files and stick them in the
autogen dir, and still have local .h files include those generated
header files. Used in gtk2hs.