Safer sync between timer list and sort radioboxes

The sync is far from being perfect, I just make sure the initial state
in __init__ is safer and in sync. Later I will implement some observer
thing that will sync the actual sort data 'model' from the 'view' which
is the timers list and checkboxes.

Also adding NotImplementedError to 'sort order by time', which I will
implement soon (hopefully).