Fix too-long lines in Swig interface file.
Fill and attach metadata in algorithm test utility code
Move low-level Sinc photometry code to a new file

This undoes some of Perry's work on DM-1067, but it's overall
a bigger cleanup and it allows us to start moving the aperture
flux implementations to a new algorithm class.
Add ApertureFluxAlgorithm base class for multiple-aperture fluxes
Add concrete algorithm class for circular apertures
Merge branch 'u/jbosch/DM-837'