Added ability to find maximum Mach number within a given radius of the domain center. Makes sense only for when the star is at the center.
Added ability to find maximum Mach number within a given radius of the domain center. Makes sense only for when the star is at the center.

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