Do the post-timestep analytics at initialization so that we're always using the same approach for the diagnostics. Previously the stellar data at t == 0 was being filled using the analytical values of the mass and center of mass location, which does not exactly match what is on the grid.
Do the post-timestep analytics at initialization so that we're always using the same approach for the diagnostics. Previously the stellar data at t == 0 was being filled using the analytical values of the mass and center of mass location, which does not exactly match what is on the grid.

BoxLib-Codes/wdmerger,BoxLib-Codes/wdmerger,BoxLib-Codes/wdmerger,BoxLib-Codes/wdmerger