> who revisites the website directly logs in to the site.
He will actually stay logged-in already, because Aida cookie will stay
in his browser and on the other side his session will stay stored on Aida.
Otherwise look at:
- WebSessionManager findOrMakeSessionFor: aRequest, where cookie is used
for finding existing session
- AIDASite addResponseHeadersTo:forPage:on: where setCookie header is
put in response in case session hasn't yet a cookie.