[Systems] Authentication in trac

[Bernie Innocenti]

Ciao,

following an enlightening tip from Noah, I finally got around to make
trac keep us authenticated longer than one day.  Let me know if it
seems to work.

I made a second attempt at installing a new version of the OpenID
plugin, but I still couldn't get it to work sanely, so I disabled it
again.

We should also upgrade to 0.11.2, but I'd prefer Ivan or Noah to do it.

-- 
   // Bernie Innocenti - http://www.codewiz.org/
 \X/  Sugar Labs       - http://www.sugarlabs.org/