[Question]: Check on cohort growth devs in the Richards growth code

[Rick-Methot-NOAA]

noted a possible discrepancy while discussing this topic with Peter Kuriyama.

cohort-growth deviations are described as a multiplier on K, but are implemented as a multiplier on the growth increment calculated from K. But for Richards growth function, the cohort growth factor seems inside the (), so directly affecting K.

[Rick-Methot-NOAA]

related to #156