Begin notificaitons

Load User()s into memory and keep them there as long as ice is
running. Began framework for notifications.
Comment notifications
TermUpdate notification

Also moved notifications to their own namespace (seaice.notify.*)
TermRemoved notification

Also, BaseNotification.getAsHTML() should return None if it attempts
to dereference a deleted row.
Remove notifications and 404 page
fooling around with prettyDate()
printPrettyDate() time elapsed
interface clean ups