Revert "Add program to zero velocity before hover/land operations."

This reverts commit bf6bbdc099.

lib/stabilize_rocket.ks

@@ -6,7 +6,6 @@
 // Do not include both this and stabilize_helicopter.ks in one program.
 
 runoncepath("/lib/sensors").
-runoncepath("/lib/node"). // TODO: move BurnTime to a more sensible library than 'node'
 
 // Convenience function for landing operations. Hover over a point with a negative velocity, shutting down on landing.
 function Land {
@@ -14,7 +13,6 @@ function Land {
 
   assumeControl().
   alignForHover().
-
   local pid is PIDLoop(0.1, 0.01, 0.01, 0, 1).
   
   lock THROTTLE to pid:Update(TIME:SECONDS, SHIP:VERTICALSPEED).
@@ -29,24 +27,6 @@ function Land {
   set SHIP:CONTROL:PILOTMAINTHROTTLE to 0.0.
 }
 
-function ZeroVelocity {
-  assumeControl().
-  alignForHover().
-  local processVar is 0.0.
-  print "Aligning.".
-  if ReadSensor("PRES") = 0 {
-    lock processVar to SHIP:VELOCITY:SURFACE:MAG.
-  } else {
-    lock processVar to SHIP:VERTICALSPEED.
-  }
-  local bt is BurnTime(processVar).
-  print "Burning.".
-  lock THROTTLE to 1.0.
-  wait bt.
-  lock THROTTLE to 0.0.
-  restoreControl().
-}
-
 // Stabilizes a rocket relative to the surface, with optional vertical
 // velocity.
 function Hover {

prog/rocket.ks

@@ -51,7 +51,6 @@ MakeMenu(
   }
 ).
 
-MakeButton(rows[1], "ZERO", { ZeroVelocity(). }).
 MakeButton(rows[1], "HOVER", { Hover(). }).
 MakeButton(rows[1], "LAND", { Land(). }).