Fixed strict type issue
Fixed strict type issue

In numpy.random.random_integers used in Python2, NumPy coerced a float
to an integer. In the version used with Python3 this is now a type
error. Recast the division into an integer to fix.

stiphyMT/plantcv,danforthcenter/plantcv,danforthcenter/plantcv,stiphyMT/plantcv,stiphyMT/plantcv,danforthcenter/plantcv