Full help/usage display and modification example

[tansy]

Example of help modification as documentation supplement.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (ef327b7) 100.00% compared to head (da0cab3) 100.00%.

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  Files           18        18           
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  Hits          4573      4573           

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[phlptp]

Thanks this looks good, I will integrate after we get the release out so it gets tested and built with all the other examples, but I think this will be helpful.

[tansy]

That 'no parameter option' was my guess, and I just noticed, that it has `level' parameter. I think that needs correction.

Shall it be encode->add_option("-R, --remove", nullptr, "remove input file"); or encode->add_flag("-R, --remove", "remove input file");?

Also I world add an option to make space between shirt and long option description (-h,--help -> -h, --help), but don't know how.