Description of wind_rose.ncl functions

wind_rose.ncl contains some wind rose plotting functions, written in NCL. These functions were written by Dennis Shea.

Using these functions requires that the gsn_code.ncl be loaded prior to loading wind_rose.ncl:

load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/wind_rose.ncl"