Improve performance of FairZ3 by lowering unrolling to the z3 level.  Improve synthesis profiling script.

Improve performance of FairZ3:

  Make function templates and unlocking/unrolling work directly at the z3 level for performance reasons.

  Implement push-pop at the unrolling-bank level. Works around a z3 bug.

  Z3 apparently side-effects during check-assumptions, causing a following
  check without assumptions to produce unreliable results. We work around this
  by backtracking to the state before the check-assumptions using
  push/pop.

Improve synthesis profiling/benchmarking:

  Move benchrmarking suite away from tests. Synthesis Rule application
  benchmark can now use a --rule option specifying what rule to apply.

  Add Testcase to evaluate CEGIS unrolling of different depth.
  Benchmarking script is now generated via the 'bench' sbt task.

sbt now generates two scripts,
  - ./leon
  - ./setupenv
setupenv needs to be evaluated before doing "sbt test". Make sure you
run it using "source ./setupenv" and not "./setupenv" so that the
exports contained in setupenv have an effect on the outer shell
context.

setupenv is used within ./leon as well

option is provided.

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after sbt package all, run:

./funcheck --CAV yourfile.scala

That's it.

still some infinite loop on some unrollings (eg. pldi/InsertionSort:min), but some examples are solved. yay.

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