Recreating Sessions

People have displayed annoyance at the way our current session expiry works: If you start editing a page, and the editing takes too long, the session may expire, and you are served a very cryptic page describing how to log into JSPWiki, or told something about Session expiration, which, of course, tells really nothing to the user.

Since this causes a dataloss of your edits, we should really try very hard to restart the Session. Obviously, this is not possible if user credentials have expired, but if the wiki is open to all, or CookieAuthenticationLoginModule is in use, then restarting the Session should be possible.