Update left_intrinsics.yml file with chessboard square_size=0.025 and with extrinsic parameters. Add camera_calibration_show_extrinsics.py, a Python sample that allows to display the extrinsics saved during the camera calibration process (cpp-example-calibration).

* Update samples

* Update calib3d.hpp

* Update calib3d.hpp

* Update calib3d.hpp

* Update calib3d.hpp

Adds fitEllipseDirect to imgproc: The Direct least square (Direct) method by Fitzgibbon1999.

New Tests are included for the methods.
fitEllipseAMS Tests
fitEllipseDirect Tests

Comparative examples are added to fitEllipse.cpp in Samples.

adding missing images from python tutorials, like chessboard.png, simple.jpg, home.jpg, fly.png, ...

Distance Transform tutorial fixes

Distance Transform fixes v.2

Distance Transform fixes v.3

Distance Transform fixes v.4

Signed-off-by: Yan Wang <yan.wang@linux.intel.com>