Project: datamanagement
Issue DM-4878: Propagate flags from individual visit measurements to coadd measurements
It is useful to be able to identify suitable PSF stars from a coadd catalogue. However, the PSF is not determined on the coadd, but from all the inputs. Add a mechanism for propagating flags from the input catalogues to the coadd catalogue indicating stars that were used for measuring the PSF. Make the inclusion fraction threshold configurable so we can tweak it (so we only get stars that were consistently used for the PSF model; the threshold might be set it to 0 for "or", 1 for "all" and something in between for "some"). Make the task sufficiently general that it can be used for propagating arbitrary flags. This is a port of work carried out on [HSC-1052|https://hsc-jira.astro.princeton.edu/jira/browse/HSC-1052] and (part of) [HSC-1293|https://hsc-jira.astro.princeton.edu/jira/browse/HSC-1293].
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