beam parameters written in degrees in fits headers
tests for the fwdbwd and clean workers
agroclean - a variant of Clark clean which uses the PCG algorithm to extract flux at component locations. This should overcome the speed limitation of single-scale clean when it reaches plateaus of extended emission
dirosion - option to create a mask from clean components by performing a binary dilation followed by a binary erosion with a simple structure function. This should preserve point sources while connecting islands of extended emission
This PR adds: