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Fix up some infelicitous coding in DefineRange, and add some missing error checks. Rearrange operator strategy number assignments for GiST anyrange opclass so that they don't make such a mess of opr_sanity's table of operator names associated with different strategy numbers. Assign hopefully-temporary selectivity estimators to range operators that didn't have one --- poor as the estimates are, they're still a lot better than the default 0.5 estimate, and they'll shut up the opr_sanity test that wants to see selectivity estimators on all built-in operators.