Bring DatabaseMetaData feature tests up to date:
* NULLs are sorted differently in 7.2 * table correlation names are supported * GROUP BY, ORDER BY unrelated is supported since 6.4 * ESCAPE/LIKE only supported since 7.1 * outer joins only since 7.1 * preferred term for procedure is "function" * preferred term for catalog is "database" * supports SELECT for UPDATE since 6.5 * supports subqueries * supports UNION; supports UNION ALL since 7.1 * update some of the max lengths to match reality * rearrange some functions to match the order in the spec for easier maintenance
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