Fixing the wrong hub counts

I've had another look at the code I wrote to enable the extended hub
count (H:3/2/1 like DC++), and I think I have fixed instances where it
may have returned the wrong counts.

In particluar, the error occurs when you lose a connection to a hub
that you are a registered user in.

The patch, to be applied to dclib-0.3.7-20061104ejs, is available here:
http://www.dcs.warwick.ac.uk/~csucda/patches/dclib-0.3.7-20061104ejs-fix-wrong-hub-count.patch

Please could people who have previously reported problems with the hub
count test this patch.

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