Change IRF plotting from imshow to pcolormesh #933
In #823 we agreed it is a good solution to change the plotting of IRFs from ´plt.imshow()´ to
Just for the record:
@adonath - Thanks!!!
Did you want to re-render the notebooks with the plots fixed?
I wanted to review content and clean up anyways, so I could do all of them in the next few hours. Just wanted to avoid duplicating work / merge conflicts in case you're doing it already.