MB-System 5.4.2168 - New Formula

I've created a formula for MB-System version 5.4.2168.  From the [official website](http://www.ldeo.columbia.edu/res/pi/MB-System/):

>  MB-System is an open source software package for the processing and display of bathymetry and backscatter imagery data derived from multibeam, interferometry, and sidescan sonars.