'Implement highlight specific for Fortran77.'

def highlight_block(self, text):

    text = to_text_string(text)
    if text.startswith(('c', 'C')):
        self.setFormat(0, len(text), self.formats['comment'])
        self.highlight_spaces(text)
    else:
        FortranSH.highlight_block(self, text)
        self.setFormat(0, 5, self.formats['comment'])
        self.setFormat(73, max([73, len(text)]), self.formats['comment'])
