A significant rewrite of the main bounce runner logic to make it

perform better.  In general there are two changes: 1) we never lock a
list until and unless absolutely necessary, 2) we only run the bounce
runner once every minute (as opposed to the normal runners'
once-per-second sleep time).  Specifically,

SLEEPTIME: The base class now looks at this attribute to decide how
long to sleep between loop iterations, and it defines a default.  We
override the bounce runner's value to lengthen the time it sleeps to 1
minute (we may eventually want to move this to Defaults.py).

__scanbounce(): Gone.  All its functionality is subsumed in the new
ScanMessages() method and the new _dispose().

__verpbounce(): Renamed to the non-method verp_bounce().  Also, we rip
out the code that iterates through all the lists if the bounce came to
the site list's -bounces address.

_dispose(): Simply calls verp_bounce() to find bouncing addresses, and
if that returns a false value (empty list), calls ScanMessages() to
see if the bounce detector can find some bouncing addresses.  If not,
we're done (after possibly forwarding the non-matching message).
Otherwise, we register the bounce either on the target mailing list,
or on all the mailing lists if this came to the site's -bounces
address.

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