Wrong index used in Demo Apps for CommandLineParser parser(argc, argv, keys); (Bug #2717)

The following files from /samples/cpp contain

parser.get<string>(1)

file:///home/harald/git/opencv/samples/cpp/brief_match_test.cpp
file:///home/harald/git/opencv/samples/cpp/chamfer.cpp
file:///home/harald/git/opencv/samples/cpp/demhist.cpp
file:///home/harald/git/opencv/samples/cpp/dft.cpp
file:///home/harald/git/opencv/samples/cpp/distrans.cpp
file:///home/harald/git/opencv/samples/cpp/edge.cpp

Especially demhist.cpp contains:

  CommandLineParser parser(argc, argv, keys);
  inputImage = parser.get<string>(1);

With this index == 1 you cannot load any image.
So I changed it to

  inputImage = parser.get<string>(0);

.... and all works fine !

As a next step I changed samples/cpp/chamfer.cpp
to the following form:

   CommandLineParser parser(argc, argv, keys);
    string image = parser.get<string>(0);
    string templ = parser.get<string>(1);

.... and all works fine !

I used opencv-master.zip from https://github.com/Itseez/opencv.git