Initialize alembic
Delete Catalogstar ra_err,dec_err,coord columns

- Don't need coord PostGIS now that I use q3c for point queries
- Catalogs don't tend to have per-star RA,Dec position uncertainties, so
  we'll drop these columns

Updates ingestbase, twomass and CatalogStar initialization
Alembic migration 40dd1894002b_delete_catalogstar_ra_err_dec_err_coord

For da9fdeb