renaming to standardize.... root_filters -> detected_root_filters. dpm_hog_descriptor -> model_root_filter. (for internal code. detectionDetails still uses 'bbox_hog_descriptor' and 'dpm_hog_descriptor' terminology.)
fixed demo_hog_visualization to work with new directory structure. did some cleanup and code reuse in demo_hog_visualization
standardizing notation in the 2 demos -- demo_sensys_dataset and demo_hog_visualization
simplifying demo_hog_visualization.m
moving imgdetect_forTracking to auxiliary_forTracking subfolder. i'm not sure that we really need imgdetect_forTracking, since it's such a simple wrapper. but, we'd have to do the pyra() in the demo script otherwise, or else compute pyra() twice.