message: Add slot0 to create a beginning of timeline slot
diff: @@ -93,6 +93,10 @@ impl TimeFrame {
  }
  }
  + pub fn slot0(&self) -> Slot {
  + Slot(self.slot_offset.0)
  + }
  +
  /// Given a system time get the slot and associated duration leftover
  pub fn slot_at_precise(&self, at: &SystemTime) -> Option<SlotAndDuration> {
  match self.timeline.differential(at) {
  