Stimulus ordering
-----------------

When a WM simulation calls for running multiple stimuli, those stimuli
are presented to the model in order during simulation unless that
order is changed as described below.


*  **stim_shuff_seed** - if non-zero, the value is used to
   block-wise randomise the stimuli.  This has the important implications:

  * Stimuli must be recreated for each repeat; therefore, this is less
    efficient than running all repeats of one stimulus before moving
    to the next.

  * Currently this **is ignored in 'mm'**, because it does not make
    sense to randomise stimuli unless they are processed in sequence.

  * The 'write_stim_num' option is ignored.