documentation about pyro2

[astroboylrx]

I'm using pyro2 with TkAgg backend. However, interactive plotting doesn't work. More specifically, plt.figure() successfully create a window, but nothing shows up in it, and then the window exits after the program ends. This issue happens on both Ubuntu 16.04 and Mac OS 10.11. With some googling, I put plt.pause(0.0001) after each sim.dovis() in pyro.py, which fixes the issue. But the official documentation of pause function does not give a reasonable explanation. Additionally, by using plt.pause(0.0001), I find the interactive plotting now even works with the "MacOSX" and "Qt5Agg" backends. I think this workaround might be useful to someone, so I comment here.

[zingale]

indeed, I see this now, it seems to be related to matplotlib 1.5 -- I just upgraded and get that error. I'll add pauses