MSVC and GCC compilers interprets cv::String a(0) as a valid
statement with conversion of "int" argument to "const char*".
This patch forbids this expected behaviour.

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.