This is an efficient C++ implementation of the Cassowary constraint solving
algorithm. Kiwi(solver) is an implementation of the algorithm based on the
seminal Cassowary paper. It is not a refactoring of the original C++ solver.
Kiwi(solver) has been designed from the ground up to be lightweight and fast.
It ranges from 10x to 500x faster than the original Cassowary solver with
typical use cases gaining a 40x improvement. Memory savings are consistently
> 5x.

This is the Python 3 version of kiwisolver and will coexist with SBo's
kiwisolver package.
