message: adds default_speed to mover class
diff: @@ -93,6 +93,9 @@ class Mover:
  def set_speed(self, value):
  self._driver.set_speed(value)
  + def default_speed(self):
  + self._driver.default_speed()
  +
  def probe(self, pose_tree, axis, movement):
  assert axis in self._axis_mapping, "mapping is not set for " + axis
  