Documentation of test_interations() function.

Doxygen reports:

warning: The following parameters of test_interactions(struct part *parts, int count, serial_interaction serial_inter_func, vec_interaction vec_inter_func, char *filePrefix) are not documented:
  parameter 'serial_inter_func'
  parameter 'vec_inter_func'
  parameter 'filePrefix'

Can we have this fixed please.

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