#6 distributed ozone nodes

[Per Nyfelt]

distributed ozone nodes: distributed
transactions/commit

"distributed ozone nodes" is very much comparable to
EJB clustering. Several ozone instances running on
different machines should act like one database.

Today, with XA in place, distributed transaction
should be not a big problem. We could employ a
transaction manager (like Tyrex) for that job.

The really tricky thing is: do objects fload around
between the nodes and how do we track them dowm later?