Partial function constructor to cut wind velocity (or others) into factor classes

Usage

cut_ws.fun(
  binwidth = 1,
  ws_max = NA,
  squish = TRUE,
  right = TRUE,
  reverse = FALSE,
  calm = NA
)

binwidth: width of the bins
ws_max: cut off wind speed at this maximum
squish: If TRUE wind velocities greater than will be include as additional level ">ws_max"
right: logical, indicating if the intervals should be closed on the right (and open on the left) or vice versa.
reverse: reverse order of result. This is sometimes useful when plotting a factor.
calm: threshold for calm wind situation. All windspeed below this limit will be assigned the the factor level "calm".

a partial cut_ws() function with ws as sole argument