[web2py] recognizing web2py restart

[Jonathan Lundell]

I've got an application that uses memcached. I'd like to recognize when web2py 
gets restarted (mod_wsgi, fwiw) so I can flush my cache. No doubt I can figure 
something out, but I'm sure I must be missing something obvious. (My 
motivation: in my development environment, I sometimes blow away my database 
when installing and starting a new copy of the app, and things get confused 
when the cache is still holding data from the earlier run.)