Fixed missing comman in pg_class query.

Added checks on row and column indexes in Pgsql::Result to detect these kind of problems earlier in the future.

pgsql/Pgsql_Result.h

@@ -127,6 +127,9 @@ namespace Pgsql {
 	//		iterator begin();
 	private:
 		PGresult *result = nullptr;
+
+		void colRangeCheck(int col) const;
+		void rowRangeCheck(int row) const;
 	};