Update cctest/inc/pars/meas.h to rename FIR_ORDERS parameters to be FIR_LENGTHS
Update cctest/scripts/tests/SPS_MPS/doc/main_loads.xlsx to define circuit simulator characteristics
Update ccref.c and ccrun.c to refactor reg.cl_period to be reg.period
Update libreg/src/sim.c to move regSimNoiseAndTone() to reg.c