SoFiA 1 transition: additional filtering at linker stage

[SoFiA-Admin]

Additional filtering options at the linker stage would be desirable. Maximum and minimum filtering options provided by SoFiA 1 include merge.minVoxels, merge.maxVoxels, merge.minLoS, merge.maxLoS, merge.minFill, merge.maxFill, merge.minIntens and merge.maxIntens. Some of these should be straightforward to implement, most notably number of voxels and filling factor filtering. Lines-of-sight filtering would be more complicated, as unique lines of sight would need to be identified, so we might skip that one.

[SoFiA-Admin]

Filtering based on the total number of pixels and the overall filling factor has been implemented (see d53414d3a96fc9b2d0bc3bc261fee92c46e6afb6). New parameter settings are available to control this: linker.minPixels, linker.maxPixels, linker.minFill and linker.maxFill.