Some cleanup, added null check functionality on arrays. Test.hs correctly tests all 16 examples now.

Implemented Wishnu’s idea for quantifier evaluation in the Test module, since that’s definitely a better idea on second thought. However, performance with complete randomness is absolutely terrible now, so that problem needs to be addressed next.

Renamed QuickCheck to Test everywhere, since QuickCheck isn’t even used in the automated testing module.

- Added correct handling of LIsnull in QuickCheck.
- Fixed a bug in Rewrite.hs that wasn’t causing issues yet, but was a bug nonetheless.
- Sped up QuickCheck tests by making the number of iterations dependent on the specific test.

  - Fixed bug that caused some QuickCheck tests to throw an exception because not a complete substitution was taking place.
  - Uncommented the legendary 16th bug that causes an endless loop when Z3 is used. It doesn’t cause an endless loop with QuickCheck, but QuickCheck does give the wrong answer :’(.

All in all, the very naive testing module correctly tests 13/16 tests at the moment (most of the time at least; it’s random).

- Removed the eval tests.
- Added tests for QuickCheck
- Note that something is broken: multiple tests fail.

- wrote a function in SimpleFormulaChecker.hs that can be used to evaluate (for now just preconditions) in java files;
- wrote some (for now) very basic tests for LExpr eval;
- worked on QuickCheck.hs, but I have some ideas (mainly regarding arrays) that I need to discuss before I proceed;
- added extra parentheses in Pretty.hs to make debugging the AST easier.

* LogicIR EDSL.
* Minimized LogicIR.
* General styling fixes.
* Supressed output in tests.
* Single-threaded test execution.

closes #21

Closes #13

closes #10