Change default blot stepsize to use WCS transform #248
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The WCS mapping in
grizli.utils.blot_nearest_exactusingastdrodrizzle.cdriz.DefaultWCSMappingseems to cause slight errors in the pixel transformations, so set the defaultstepsize=-1in various places to fall back to the nominal WCS transformationout_wcs.all_pix2world > in_wcs.all_world2pix.The most notable place where the issue affects the output was in
grizli.prep.subtract_visit_angle_averages, where the blotted angle averages didn't line up correctly.