BUG: incorrect order for output scaling (transformPoints, ...)

- the output write scaling should be applied *after* undoing the
  effects of the specified rotation centre. Fixes #2566

ENH: update option names for transformPoints and surfaceTransformPoints

- prefer  '-auto-centre' and '-centre', but also accept the previous
  options '-auto-origin' and '-origin' as aliases.

  Changing to '-centre' avoids possible confusion with
  coordinate system origin().