voodoo planner update

Here's where things get interesting:

now things have flipped around!

billdate = 1 is SLOWER than billdate = any other value

# explain select s.id from subaccounts s, accounts a where a.id = s.idaccount and a.billdate = 2;
NOTICE:  QUERY PLAN:

Nested Loop  (cost=0.00..16.42 rows=2 width=12)
  ->  Index Scan using idxaccountbilldate on accounts a  (cost=0.00..2.02 rows=1 width=4)
  ->  Index Scan using idxsubprimary on subaccounts s  (cost=0.00..14.22 rows=15 width=8)

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

# explain select s.id from subaccounts s, accounts a where a.id = s.idaccount and a.billdate = 1;
NOTICE:  QUERY PLAN:

Hash Join  (cost=79.83..310.33 rows=3506 width=12)
  ->  Seq Scan on subaccounts s  (cost=0.00..71.10 rows=3510 width=8)
  ->  Hash  (cost=76.03..76.03 rows=1520 width=4)
        ->  Seq Scan on accounts a  (cost=0.00..76.03 rows=1520 width=4)





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