add extra psf_clean() call
checkpoint
fix microbug in Comp2PsfDeterminer
fix microbug in Comp2PsfDeterminer
some minor tweaks, syncing with hscPipe 3.1.2
use PTR(HscSpatialModelBase) in polypix constructor, rather than integer spatialOrder
oops, replace one instance of size by psf_size
change behavior of PolypixPsf::_upsample() near edge
use flagKey instead of candidate status, in comp2PsfDeterminer and polypixPsfDeterminer