Fixed issue with magnitudes when used as PSF model parameters (thanks to A.Donnarumma for reporting this issue).
Added ID_PARENT catalog parameter to identify the common parent of deblended sources (thanks to R.McMahon for the suggestion).
Introduced regularization of Sersic model ellipticities based on AMALGAm prescriptions for the Great3 challenge (see Mandelbaum et al. 2015).
Fixed error in ecliptic coordinate computations (thanks to H.Bouy for reporting this issue).
Added support for differential geometry maps, with new DGEO_TYPE and DGEO_IMAGE configuration keywords and new DGEOX/Y_IMAGE and DGEOX/YWIN_IMAGE measurement parameters.
Added differential geometry map correction to model-fitting.
Added VIGNET_DGEOX and VIGNET_DGEOY differential geometry map cutouts in catalogs (for use in PSFEx).
Added support for PSF model dependencies in ASSOC vectors.
Fixed issue with single-line background meshes.
Fixed positional offsets of large galaxy models on MODELS and -MODELS check-images.
Pushed version number to 2.23.1.