OR clause status report

I have succeeded in making OR clauses use indexes.  I have not dealt
with some of the more complex issues like x=3 or y=5 as Vadim mentioned,
but at least it works.

	test=> select * from test where x=102532 or x=102533;
	     x
	------
	102532
	102533
	(2 rows)
	
	test=> explain select * from test where x=102532 or x=102533;
	NOTICE:  QUERY PLAN:
	
	Index Scan using i_test on test  (cost=4.10 size=1 width=4)

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