allow for changing line_thickness in pcv.create_color_card_mask
allow for changing line_thickness in pcv.create_color_card_mask

Allow for changing line_thickness in pcv.create_color_card_mask.

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