Use ROI selector in python samples

- added area under "lost track ratio" curve statistics
- added "lost track ratio" curve plot
- minor fixes

- used C++ to handle resources and output
- simplified and refactored the code
- changed statistic calculation (precision, recall, etc)
- used CommandLineParser -> CL interface has changed

Now algorithm names are overlayed with image and number of frames
assessed can be given via command line (e.g. -a=100 to assess first 100
frames).

With all functionality preserved. Pure renaming.

This contribution includes the following logical components into
tracking module:

.) Change Rect to Rect2d into headers for Tracker's methods;
This contribution includes the following logical components into
tracking module:

.) Change Rect to Rect2d into headers for Tracker's methods;
.) MedianFlow tracker;
.) extensible benchmark to compare trackers interactively and
	assess them quantitatively;
.) TLD tracker (work-in-progress);

Work was funded by Google Summer of Code 2014 initiative. Mentors:
Gary
Bradski and Vadim Pisarevsky.