CIDEVMI-1031: R2 versions of VEL3D-K with DOSTA edits

@cwingard Ready for review and merge  **Now available for R2!!!**

Completes the epic saga of the VEL3D-K instrument and it's harrowing details of beam to Earth coordinate transformations. 

Also cleans up DOSTA codes and adds a test data set and a performance test. (I was lazy and didn't make its own branch)