Fixed various issues

I found some occasions where the any() function was evaluated on columns instead of rows, leading to bogus results. Additionally, I fixed an error in the calculation of the overlap of bounding boxes that occurred when both the horizontal and the vertical intersection was negative. For the skipping experiment, sequence_skipping() was called twice, resulting in much more frames dropped than probably was intended and also the second call was not remembered for the ground truth values, so I removed the second call. For the region noise experiment, the intitialisation bounding box ends up as a tupel of float values, such as 183.41552, 54.251125, 50.125125, 48.125259. The sample matlab tracker got confused, as it expected only integer values, so I modified get_initialization_region() as to round the initialisation bounding box.