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  Name:     maxrow() - get the maximum allowable row number
  Usage:    <integer> = maxrow()
  Params:   none
  Returns:  integer equal to the maximum allowable row number

 ---------------------------------- Example ---------------------------------

                 box(0,0,maxrow(),maxrow())
                 * draws a box around the screen, independent
                 * of any screen modes.

                 setmode(43)         && 80x43
                 ? maxrow()          && prints 42

                 setmode(3)          && normal 80x25
                 ? maxrow()          && prints 24

  Note:     This function is important since you may change the
            size of the screen by using the setmode() command, or
            the setscreen() command. If you setscreen() to a new size
            window, then maxrow() returns the maximum allowable
            row number for the size screen you set with setscreen().
            Using maxrow() in your functions can ensure that your
            routines will work regardless of the current video mode
            or screen size.