Computation times

00:21.318 total execution time for 3 files from examples/topology_optimization:

Example	Time	Mem (MB)
Solve a 2D MBB topology optimization problem (plot_topology_optimization_MBB.py)	00:08.554	0.0
Solve a 2D short cantilever topology optimization problem (plot_topology_optimization_short_cantilever.py)	00:08.411	0.0
Solve a 2D L-shape topology optimization problem (plot_topology_optimization_L_shape.py)	00:04.352	0.0