Tweak the postprocessing class so that it can be used from outside the package more easily. Also add some control of iterations to postprocess. We can't call it for nonmultiples of `niter_out`, but I don't see that as a problem right now.
Tweak the postprocessing class so that it can be used from outside the package more easily. Also add some control of iterations to postprocess. We can't call it for nonmultiples of `niter_out`, but I don't see that as a problem right now.