Drizzlepac: Ensure the "best" WCS solution is found when using a set #1638
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Made the wcs_preference string more explicit as to the priority order of the common desired WCS solution when selecting from a set. This was necessary as there are six possibilities at this time (e.g., GAIAeDR3, GAIADR2, and GAIADR1 for REL and IMG alignment) for matching to GAIA, and the most up-to-date GAIA solution is what is wanted.
Note: The case of the WCS solutions is not altered (to upper- or lower-case) throughout the source code.