This function returns the remaining command line arguments after
you have run Getopt.find_option or Getopt.find_all_options to find
all the options in the argument list. If there are any options
left not handled by Getopt.find_option or Getopt.find_all_options
this function will fail.
If throw_errors has been specified Getopt.get_args will throw errors
on failure. If it has been left out, or is 0 (zero), it will
instead print an error message on Stdio.stderr and exit the
program with result code 1 on failure.
Getopt.find_option()