OVDB problems

[Alex Kiernan]

After a bit more debugging, I think I'm reasonably confident that the
interprocess locking which is supposed to happen between innd and
expireover isn't working (mostly I'm relying on Purify for this
diagnosis).

I'm going to try wrapping transactions around some more of OVDB (which
shouldn't be necessary according to the docs) and see if it changes
the behaviour.

-- 
Alex Kiernan, Principal Engineer, Development, Thus PLC