Improvements to sessionfilter: using lazy loading of session data (so data is never loaded/saved if user doesn't access it). Make acquire_lock work as expected.
Improvements to sessionfilter: using lazy loading of session data (so data is never loaded/saved if user doesn't access it). Make acquire_lock work as expected.

Safihre/cherrypy,Safihre/cherrypy,cherrypy/cheroot,cherrypy/cherrypy,cherrypy/cherrypy