Logged the filtered but not zeroed position.

Change-Id: Ica47de1c6b84fd71540428cba06ac266d2e899fe
diff --git a/frc971/control_loops/control_loops.q b/frc971/control_loops/control_loops.q
index 37a6420..34b2467 100644
--- a/frc971/control_loops/control_loops.q
+++ b/frc971/control_loops/control_loops.q
@@ -29,6 +29,9 @@
   bool zeroed;
   // The estimated position of the joint.
   double position;
+
+  // The estimated position not using the index pulse.
+  double pot_position;
 };
 
 // A left/right pair of PotAndIndexPositions.