Previously, there's no way to the user see the found corners, i've changed that.

In a cout, are write that: "average reprojection err = "
But it isn't a "reprojection error" at all, it is a mean of each EPIPOLAR error, wich occur when the product x' * F * x is not equal to zero.
(x and x' are the same points in the right and left scene)
(the RMS that explain the average absolute reprojection error is given by the return of the stereoCalibrate() function)

At least, i think it's interesting to initialize the camera matrices before.

Thank you all for this amazing code. Apologize my weak english.

fixes #5074

Refer to the following issue for detail:
https://github.com/Itseez/opencv/issues/5145

removed unused context_id2; changed blur size 7x7 to 3x3; added short comments
removed unnecessary call to convertFromVASurface()
replaced dumpSurface() with writeImage()
added infile cmdline parameter, input image loaded by imread()

some mandatory string keys like paths must not be empty. Add the special
default value `<none>` so the CommandLineParser can enforce this and
generate an according error message for us.

in documentation exact path is images/CameraCalibration/VID5

requesting a previously undeclared key is most likely an programming
error. e.g. a typo "--unused vs --unsued".
So throw in those cases.

Add an according failure testcase.

And refactor the code to make sure that the dev and runtime package lists are
in sync.

Because that's the variable actually used by CPack.