fixed kn_expires in pubsub.py PubSub Server

For those of you keeping your cvs accounts up-to-date, do a cvs update
on

   mod_pubsub/python_pubsub

which will update a few of the files there.  Thanks to the valiant
efforts
of Joyce, we were able to track down and remedy a memory leak due to not
properly cleaning out expired events.  I believe the updated changes
will
allow a person to run pubsub.py for days-to-weeks without memory issues.

Joyce will verify this (or not!) as she watches the server on

   http://www.mod-pubsub.org/

in the future.

I think I'll wait another week before packaging a new v0.96 tarball that
includes this critical set of changes to the server.

By the way, for my testing of this server fix, I added to cvs a short
program

   mod_pubsub/python_pubsub/apps/publish.py

that publishes events of the specified size to the pubsub server, using
pubsublib.py .

I think next up is an investigation of using ZODB for the event pool
persistence.  Will let you know when/if I learn anything...

   Adam


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