sympy/sympy — pull request #1429 by scolobb (2012-07-18 18:00:41+00:00)
Title: Diagram Layout

This pull request adds the code which lays out the objects of a diagram, depending how they are connected with morphisms and some other parameters.

Some tests for this pull request still fail half of the time, because of the issue with `FiniteSet` sort keys. I do submit this pull request though so that people can start reviewing it, while I'll be fixing the `FiniteSet` issue in parallel.