Edit laps and detect intervals

[Daniel Besse]

Lap editing (start and stop time)

Propose laps based on interval detection (for instance based on cumsum changepoint detection, see attached file)

[Daniel Besse]

Implementation in ExprEval:

save("watts", equallyspaced_streams("watts", 1); retrieve watts
save("changes", changepoints(recall("watts"), avg(recall("watts")))); find changepoints
; apply changes (!WARNING! this will change laps data without any undo possible)
alter_activity_laps(recall("changes"))