Verbose to stdout and handling of long-only options. #262
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… this is future-proof for future long-only options
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This PR moves some verbose messages from stderr to stdout when they are about non generic situations instead of actual errors.
It also handles a little bit differently the parsing of the random-seed. This will be easier in the future when other long options, with no corresponding short options, might be introduced. This is inspired by the code of ls from coreutils.