OP2/PyOP2 — pull request #106 by kynan (2012-11-07 13:30:32+00:00)
Title: Sparsity extension module

Resurrect C++ sparsity building routine as an extension module.

The speedup is significant:
Python:
![Build sparsity in Python](http://amcg.ese.ic.ac.uk/~fr710/plots/benchmarks/pyop2/sparsity_build_py.svg)
C:
![Build sparsity in C](http://amcg.ese.ic.ac.uk/~fr710/plots/benchmarks/pyop2/sparsity_build_c.svg)

[Passes on buildbot](http://buildbot-ocean.ese.ic.ac.uk:8080/builders/pyop2-testing/builds/458)