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Package will be reconfigured with test suites enabled, if necessary.

Change the behavior of 'cabal build' to automatically run 'cabal
configure' if the package in the current directory has never been
configured or if the configuration is outdated. In the former case, use
the default options or in the latter case, use the most recently used
options.

Contributed by Hideyuki Tanaka.

Fixes #980 by allowing to create config fields from options with optional
arguments. Without this change, setting the 'jobs' or 'verbose' fields in the
config file results in a fatal error on startup.

Contributed by Tuncer Ayaz.

Fixes #982. Additionally, running 'install -j' without the numerical argument
will have the same effect at runtime.

Side effect: 'install -jNUM' doesn't work when there's a space between -j and
NUM.

Remove the bitrotted UnitTest test suite and also no longer used build
infrastructure.

The test suite is so bitrotted that it's beyond salvaging and it'll be
deleted in a subsequent commit. This commits records the changes
needed to at least get it to compile again.

Without the lower bound, test-framework-quickcheck2-0.2.4 is picked
and that version fails to compile against QuickCheck.

-package-db only exists on GHC >=7.5 so we use (the now deprecated)
 -package-conf flag instead.

cabal was failing with:

$ cabal --config-file=/home/hackage-docs/hackage-docs/build-cache/cabal-config install --enable-documentation --enable-tests --haddock-html-location='http://192.168.142.1:8080/package/$pkg-$version/doc' --haddock-option=--built-in-themes --haddock-contents-location='http://192.168.142.1:8080/package/$pkg-$version' --haddock-hyperlink-source --prefix=/home/hackage-docs/hackage-docs/build-cache HUnit-1.2.5.1
Resolving dependencies...
/home/hackage-docs/hackage-docs/build-cache/local.conf.d/package.cache: openBinaryFile: does not exist (No such file or directory)
cabal: /home/hackage-docs/.cabal/logs/HUnit-1.2.5.1.log: resource busy

as it tried to open the log file for reading when it already had it open
for writing:

open("/home/hackage-docs/.cabal/logs/HUnit-1.2.5.1.log", O_WRONLY|O_CREAT|O_NOCTTY|O_APPEND|O_NONBLOCK, 0666) = 3
open("/home/hackage-docs/.cabal/logs/HUnit-1.2.5.1.log", O_RDONLY|O_NOCTTY|O_NONBLOCK) = 5
close(5)                                = 0
close(3)                                = 0

Example of what happens in the normal case: https://gist.github.com/3032723
Example of what happens in case of error: https://gist.github.com/3032939

The function is very short and the name doesn't communicate clearly what it
does.

Significantly speeds up parallel builds.

Needed for the parallel builds.