#11 Connection counters go negative

[Glauber]

It's possible for connection counters to go negative thus:

1) Start balance and create connections
2) Stop and restart the controlling process, leaving the connections intact. This will set connection counters to zero.
3) As those connections disconnect, balance's counters go negative (negative numbers in the "c" column).

IMHO, counters should decrement to zero but not be allowed to go negative.