-Char and attribute of EndOfLine ID.

             OPT EOL { " " | eol-char | 0xXX | default } [ON | OFF]

              eol-char:char code of EndOfLine ID.
#ifdef UNX
    #ifdef AIX
              default :"_".
    #else
              default :x1d except under kon. "_" under kon.
    #endif
#else
              default :x1b.
#endif
              ON      :display attr is same as of lineno-column.
              OFF     :display attr is same as of file content display
                       column.

              (ON/OFF is applied to both EOL and FOLD char)