pubsub.py improvements: default expires, caching JavaScript & blanks.

For those folks keeping their checkouts up-to-date, do a top-level cvs update to get the latest Python PubSub Server changes.

First is Joyce modified the server to force events to have default kn_expires of 60 seconds when not specified by the app developer.  Thanks Joyce!

Second is we modified the server to cache the results of five do_methods (blank,  lib, libform, lib2form, and whoami).

This might fix the "space pigeons" bug -- Robert, empty your cache and we'll see if the patch to pubsub.py we just checked helps when you access Cafe PubSub

    http://www.mod-pubsub.org/kn_apps/presence1/

By the way, these changes make pubsub.py feel faster.  The reason is, every time you publish, it uses do_method blank to draw the form that it fills out to send a request to the PubSub Server.  Now that blank is cached, it's one less round trip per publish.

(I also made some edits to some kn_docs/ and kn_apps/presence1/ for folks updating at home.)

   Adam


P.S. -- Congrats to everyone, we're about to pass 8000 pageviews on the http://mod-pubsub.sf.net/ ... thanks to Scott & Matt's blogchatter buzz ...


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