SDP_AFFINE (Low-level) Affine transformation

   P=SDP_AFFINE(ROT,OFFSET)
   P=SDP_AFFINE(ROT,OFFSET,LAB)

 INPUT
  RO       rotation matrix or vector (in case of scaling)
  OFFSET   offset vector
  LAB      sdlab object with output labels (optional)

 OUTPUT
  P        pipeline object

 DESCRIPTION
 SDP_AFFINE implements linear transformation of data using the rotation
 matrix and offset vector. Vector ROT may be used for scaling.
 Labels LAB for the pipeline output are optional. If not specified,
 'Output x' label format is used.