Fixed bugs in 1.3:

FIXED: 1. Due to a badly put end condition (tracked_areas_num instead of tracked_areas_num-1) in the code to search for the best candidate merge areas, it will merge always with the first area, as he last one always has merge_with==0, merge_overhead==0.

FIXED: 2.I forgot to consider intersections of the tracked_areas when calculating the final area span. It's simply a matter of putting the code to calculate the intersection of two areas used in the MergeOne function in a separate function and use it when calculating the final area span.

FIXED: 3. Wrong number of parametrs message on --help

CAN'T REPRODUCE: 4. Refresh is called more often than 500ms in some setups (200 times per second in certain laptop!).

