removed trailing backspaces, reduced number of warnings (under MSVC2010 x64) for size_t to int conversion, added handling of samples launch without parameters (should not have abnormal termination if there was no paramaters supplied)

Purpose: 2nd review cycle: many links in this topic are broken (don't know why). The table in the very beginning includes two functions only. what about the rest?

added color_histogram.py sample
work on VideoSynth (chessboard)