Refactor some functions only used once.

lib/navigation.ks

@@ -1,22 +1,5 @@
 // functions for calculating steering values.
 
-function GetPitch {
-  parameter v is SHIP:FACING:FOREVECTOR.
-  return 90 - vectorangle(SHIP:UP:FOREVECTOR, v).
-}
-
-function GetAscentVector {
-  parameter minPitch.
-  // face prograde, but hold a solid eastern heading and don't
-  // rotate the ship
-  local newHeading is lookdirup(SHIP:SRFPROGRADE:FOREVECTOR,
-    heading(90, 0, 270):TOPVECTOR).
-  if GetPitch(newHeading:FOREVECTOR) < minPitch {
-    set newHeading to heading(90, minPitch, 270).
-  }
-  return newHeading.
-}
-
 // Create a node that will circularize the orbit.
 // 'where' can be one of:
 // the special string "APO", for the next Apoapsis.