Staging, before I start tuning the pdfs
Improved volume labeling and solved some bugs in the figure generating scripts
Solved a bug in Entity.mask, that was using an empty array insted of a zero-initalized array.
Plots are kind of stable, but I will change from vorticity magnitude
to vorticity magnitude intensity (dB)
Staging before I start testing the new kdtree implementation provided by scipy.
Now distance computations need scipy 0.12. I get a speedup of 10 YAY!