Corrected indentation in constraint factory.
Remove trailing comma from constraint toString.
Made benchmark.
refactored method in constraint systems
Increase benchmark size.
Revert "Increase benchmark size."

This reverts commit 03941486ba910ad6a86a89cfca0b9435bfc29d14.
Add flickering for Linux.
Longer warmup to see pypy jitter.
Created point class.
Check function must always use all parameters.
Fixed constructor bug in Method.
Implemented check function.
Change default for checking constraints.
Do not check if constraints if skipping in remove_constraints.
Run performance tests in testsuite as well.
Fixing imports for Python 2 and PyPy.
performance improvements for python2.7
removed import, which is no longer used
unenforced_contstraints is now a set
added time import