VXQuery now has support for joins on two datasets. Below are the number for
a system with one core and one partition. I have a few changes to make
based on Tills feedback and then I will be able to commit it for a full
code review.

Query q04 (500mb)
---------------
 18,694ms Saxon - Nested Loop Join
  9,623ms Saxon - Nested Loop Join (switched the order of the datasets)
129,788ms VXQuery - Nested Loop Join
 17,795ms VXQuery - Hash Join

Query q05 (500mb)
---------------
 48,264ms Saxon - Nested Loop Join
 20,466ms Saxon - Nested Loop Join (switched the order of the datasets)
133,802ms VXQuery - Nested Loop Join
 17,863ms VXQuery - Hash Join

I will set send out more numbers as I get them.

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