Rudimentary pubsub.py statistics

Committed into cvs is an updated

    mod_pubsub/python_pubsub/pubsub.py

that includes basic statistics, published every second.

Topics are /kn_statistics/%statname%/ where %statname% are:
    starttime
    uptime = time.time() - starttime
    openedconns
    closedconns
    liveconns = openedconns - closedconns

kn_id of each update is also %statname% and
kn_payload is the sampled value at the last update.

pubsub.py also posts all stats to /kn_statistics for compatibility
with the watchdog library.

Net-net is that you can now watch rudimentary server stats.
I checked in an example app called "statwatch" -- it's not
much but it demonstrates what's cool about having statistics:

    http://pubsub.knownow.com/beta/kn_apps/statwatch/

This was inspired by Mike's call-to-action about the
PeopleOnPage app

    http://sourceforge.net/mailarchive/forum.php?thread_id=2627726&forum_id=12984

Live statistics takes us one step closer...

    Adam


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