was not getting the v ptr and gradp_x/y correctly.  Now it runs and looks approximately ok for a while, but then some cruft builds up.
was not getting the v ptr and gradp_x/y correctly.  Now it runs and
looks approximately ok for a while, but then some cruft builds up.

harpolea/pyro2,zingale/pyro2,zingale/pyro2,harpolea/pyro2