Refactor calibrate.register to use reproject #112
Description
In GitLab by @wtbarnes on Mar 12, 2022, 10:54
Currently, register (which mimics the usual aiaprep workflow) using sunpy.map.GenericMap.rotate to rotate, scale, and translate the image.
Instead, we should just use reproject to reproject the level 1 image into a WCS which has the desired scale (specified using CDELT) and orientation (specified using the PC matrix) and puts the center of the sun at the center of the pixel grid (in the case of a full-disk image).
This would also resolve #112.