Merge branch 'AddWeatherElements' into 'develop'

Add 10m wind speed and direction to the list of weather elements

See merge request VIPS/VIPSCommon!11

src/main/java/no/nibio/vips/util/WeatherElements.java

@@ -108,6 +108,14 @@ public class WeatherElements {
      * Average wind speed (meters / second) for the last 10 minutes, measured at 10 meter height
      */
     public static final String WIND_SPEED_10MIN_10M = "FF";
+    /**
+     * Average wind direction for the last 10 minutes, measured at 2 meter height
+     */
+    public static final String WIND_DIR_10MIN_2M = "DD2";
+    /**
+     * Average wind direction for the last 10 minutes, measured at 10 meter height
+     */
+    public static final String WIND_DIR_10MIN_10M = "DD";
     /**
      * Potential evapotranspiration by the Penman equation
      */