-Command logging.

             OPT CMDLOG [ON|OFF]

             command logging to logfile ::cl. default is OFF.
             (for GCC and OS/2 once set OFF before open by Edit/Browse cmd)
             line of ::cl accept "#" edit line cmd to re-execute cmd
             (timestamp field is ignored).
             useful for also create EXE cmd file.

             sample cmdlog.
                === log opened === : 2005/04/12 20:50:14
                =20:50:17.937:e x1
                =20:50:23.828:e ::cl
                =20:50:56.953:e x2
                =20:51:00.484:e ::cl
                =20:51:06.203:e xefunc2.c
                === log closed === : 2005/04/12 20:51:33