First draft of typesetting engine

I implemented the Knuth-Plass algorithm. If necessary, I can simplify the code (the current version may work for circle or triangle-shaped text, [see this example](http://www.bramstein.com/projects/typeset/) but we don't need such advanced use).

The PostScript part still needs to be done.
Might comment how the concept of a 'max int' is sort of irrelevant in Python because of intrinsic bigints, so it is legitimate to pick some arbitrarily large value for your use case.