astropy.wcs.WCS now recognises the TPV, TPD, TPU, DSS, TNX and ZPX polynomial distortions. Added relaxation flags to allow PC0i_0ja, PV0j_0ma, and PS0j_0ma (i.e. with leading zeroes on the index). Tidied up error reporting, particularly relating to translating status returns from...
Providing an optional parameter, when running astropy.wcs, to force SIP not to be used (ie treat the image as already distortion-corrected) even if there are SIP coefficients in the header. This optional parameter would not be active by default (ie, default behaviour would remain unchanged),...