Sets the appropriate verbosity.
        Must be called after self._test_target_files so that self.target_files is properly set.

def _set_verbosity(self):
        '''
        Sets the appropriate verbosity.
        Must be called after self._test_target_files so that self.target_files is properly set.
        '''
        # If more than one target file was specified, enable verbose mode; else, there is
        # nothing in some outputs to indicate which scan corresponds to which
        # file.
        if len(self.target_files) > 1 and not self.verbose:
            self.verbose = True