Fix both files can return an error#188
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* ArgParser: removed default option, which does not exist in GNU diffutils * fix test 'cannot_read_files' (same as PR uutils#188) * merge test from PR uutils#159
Instead of 'fixing' the test, the program now acts like the GNU original and returns up to two error messages, one for each file.
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The PR #159 changed the integration test cannot_read_files to only check for at least one file-not-found-error. GNU diff returns one file-not-found-error for each of the two given files.
This PR changes the test back (and includes the other utilities, as it was only run for 'diff') and I changed the code so that now both error message appear.