Commands added to the scripting language

The new parallel loading routine can be invoked in a similar manner to the current serial routine.

 LOAD_MCTSCANPAR <X> <Y> <Z> <filename>

Similarly for the new parallel output routine.

 PARPRINT_X <filename>

These commands are interchangeable with their serial counterparts and one may elect to use only one of the pair, i.e. one may choose parallel input with serial output or vice-versa, as needed.