[Seaside] Moving to 2.8

[Keith Hodges]

> I'm sure I could come up with more.
>
> Philippe
Gjallar uses them for login, I think (since I didn't write the code) 
that the reason is that at least you can stay logged in,  even if you 
cant keep your seaside session alive indefinitely.

Since it is common to subclass WASession, I am not convinced that 
putting extra behaviour in WACookieSession is helpful. Fortunately we 
arent using session cookies.


Keith