Resolves #22 (Depth/Area fitting)

New equations where produced from measurements of holes' mean depth and area

	modified:   pandora_vision_hole_detector/cfg/depth_cfg.cfg
	modified:   pandora_vision_hole_detector/cfg/hole_fusion_cfg.cfg
	modified:   pandora_vision_hole_detector/cfg/rgb_cfg.cfg
	modified:   pandora_vision_hole_detector/include/rgb_node/hole_detector.h
	modified:   pandora_vision_hole_detector/launch/pandora_vision_hole_detector2.launch
	modified:   pandora_vision_hole_detector/src/hole_fusion_node/depth_filters.cpp
	modified:   pandora_vision_hole_detector/src/hole_fusion_node/hole_fusion.cpp
	modified:   pandora_vision_hole_detector/src/hole_fusion_node/hole_merger.cpp
	modified:   pandora_vision_hole_detector/src/rgb_node/hole_detector.cpp