fip-0100: update total power and record a TODO

1. We need to add to the total power when adding sectors, and deduct
when deleting partitions.
2. We're going to need to figure out some way to handle fees when we
compact partitions.

actors/miner/src/deadline_state.rs

@@ -503,6 +503,7 @@ impl Deadline {
             .map_err(|e| e.downcast_wrap("failed to add expirations for new deadlines"))?;
         self.expirations_epochs = deadline_expirations.amt.flush()?;
         self.daily_fee += &total_daily_fee;
+        self.total_power += &total_power;
 
         Ok(total_power)
     }
@@ -763,6 +764,15 @@ impl Deadline {
 
         self.live_sectors -= removed_live_sectors;
         self.total_sectors -= removed_live_sectors + removed_dead_sectors;
+        // we can leave faulty power alone because there can be no faults here.
+        self.total_power -= &removed_power;
+        // XXX: we need to either:
+        //
+        // 1. Update the daily fee here (which means we need to add this information to the partitions).
+        // 2. Add a flag to `Deadline::add_sectors` indicating that we don't want the fee updated
+        //    (because it has already been accounted for.
+        //
+        //  The first option is nice and symmetric. The second saves us some state.
 
         // Update expiration bitfields.
         let mut expiration_epochs = BitFieldQueue::new(store, &self.expirations_epochs, quant)