GitLab

err_exit():  Allow the return code to be passed in, with a default of 2
    (the usual Unix return code for command-line errors).

main():  Remove the try/except that caused a second err_exit() call after
    the first call to sys.exit().  The try/except also prevented the
    first sys.exit() from actually doing so (only the second, unintended
    call caused the script to exit).

    When the users *asks* for help (-h), use a return code of 0 since
    there was not an error that triggered the help message.