added haze removal tool

Based on the paper:
  "Single Image Haze Removal Using Dark Channel Prior" by He, Sun and Tang
using a guided filter for the "soft matting" of the transmission map

rtgui/addsetids.h

@@ -142,6 +142,7 @@ enum {
 	ADDSET_BAYER_DUALDEMOZCONTRAST,
 	ADDSET_XTRANS_FALSE_COLOR_SUPPRESSION,
     ADDSET_SOFTLIGHT_STRENGTH,
+    ADDSET_DEHAZE_STRENGTH,
 
     ADDSET_PARAM_NUM // THIS IS USED AS A DELIMITER!!
 };