Parallel compilation: "gf -make -j" and "gf -make -j=n" now work as expected

  * "gf -make -j=n" uses n parallel threads.
  * "gf -make -j" adapts to the number of processors in the system.

This mimics how "cabal build -j" and "ghc --make -j" works.

Support for this is implemented in the new module GF.System.Concurrency and
it depends on the function Control.Concurrent.setNumCapabilities, which is
only available in GHC>=7.6 (base>=4.6). GF can still be compiled with
GHC<7.6, but then you have to use +RTS -N -RTS to take advantage of
multicore processors.

To detect the number of processors in the system, the code depends on a
foreign import of a C function in the GHC run-time system.

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