Error messsage from 'cint -n' is missleading

[matheustavares]

When running cint -n the following error message is retuned: cint: error: argument -n/--numbers: expected at least one argument. Although this is, in fact, an invalid execution, the error message erroneously says that "at least one argument" is expected, when we really need at least two.

[matheustavares]

Since c976faf ("Allow to receive sample of size 0 and 1 too", 2021-11-22), cint can receive less than two numbers for better usage in automated scripts. So this is no longer an issue. If the user runs cint -n, the default output would be "n/a ± n/a (confidence of 0.95)".