Moves validation_process back to thresholded weighting.

Plus, adds option to visualize the watersheded backprojection of the
input RGB image, in the checkHolesTextureBackProject filter.

	modified:   pandora_vision_hole_detector/cfg/hole_fusion_cfg.cfg
	modified:   pandora_vision_hole_detector/include/utils/parameters.h
	modified:   pandora_vision_hole_detector/launch/pandora_vision_hole_detector_standalone.launch
	modified:   pandora_vision_hole_detector/src/hole_fusion_node/hole_fusion.cpp
	modified:   pandora_vision_hole_detector/src/hole_fusion_node/rgb_filters.cpp
	modified:   pandora_vision_hole_detector/src/utils/parameters.cpp