stdin: fix false no file test and add tests for stdin #271
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Commit 5a14efc broke input from stdin, with the check added for actually existing files. Add an exception when the file input is "-" so reading from stdin works again. The original commit that introduced this feature did not include documentation. Add documentation to "--help", manpages and the README. Add testing for reading from stdin with python3 so future commits will not break the feature unintentionally.
Fixes: #270