Example command line from issue 25 does not work with current code

[Hermann-SW]

While waiting for doc issue 42, I looked into closed issues.

#25 contains example execution that does not work at all right now:

hermann@7950x:~/Carmichael/code_for_MSPP/c_code/single_core$ ./a.out 5 1 1 1 1 1 --ham 15 -b 20 -f 1
Setting up arguments
Group validation failed somewhere!
  ./a.out {OPTIONS} [integers...]
...

Has commandline argument handling changed?
What is a working command line?