notUpdated is a Set, to a for-in loop doesn't work.

Fixes #657

Mobile browsers will often show or hide the address bar while scrolling.
This causes resize events which would often reset the signal graphs.

Fixes #662

Fixes #614

Allows simple handling of cached events.

On the status page statistics section counters for transmitted and received traffic were mixed up. Transmitted traffic was shown as received while received traffic was shown as being transmitted.

Fixes #586