Correct root part offset and rotation

This improves built vessel orientation for the micro pad. However, it
works correctly only when the rotation to get the node pointing up is
around the X axis.

Source/DisposablePad/DisposablePad.cs

@@ -246,8 +246,8 @@ public void SetShipTransform (Transform shipTransform, Part rootPart)
 				pos = rootXform.TransformVector (n.position);
 			}
 			Debug.Log ($"[EL] pos: {pos} rot: {rot}");
-			shipTransform.position = pos;
-			shipTransform.rotation = rot;
+			shipTransform.position = rot * -pos;
+			shipTransform.rotation = rot * shipTransform.rotation;
 		}
 
 		public Transform PlaceShip (Transform shipTransform, Box vessel_bounds)