Convert to the 4.0 API, and make use of storage API?

[krivit]

This could simplify and speed things up significantly:

1. No need for the FOR_EACH_TOGGLE/TOGGLE_IF_MORE_TO_COME/UNDO_PREVIOUS_TOGGLES construct.
2. No need to call Calloc()/Free() each call: can allocate on initialisation and free on finalisation.
3. Probable algorithmic improvements by being able to cache useful information that persists between calls and tracks the network as it changes.