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Don't assume arcseconds when CUNIT metadata isn't present #2847
Blindly assuming that data is in units of arcseconds seems like a Bad Idea. A concrete example is LASCO C3 data that doesn't have any metadata (see #2775 (comment) and comments below). Currently LASCO C3 data with missing metadata is assumed to be in arcseconds, which is completely wrong and results in e.g. the draw-solar-limb function putting the solar limb in completely the wrong place without even a warning.
At the very least I think assuming arcseconds when metadata is missing should be done on an instrument-by-instrument level, and not in