Mark lines on the virtual display for redisplay
void SLsmg_touch_lines (int r, unsigned int nr)
SLsmg_touch_lines marks the nr lines on the virtual
display starting at row r for redisplay upon the next call to
SLsmg_refresh.
This function should rarely be called, if ever. If you find that
you need to call this function, then your application should be
modified to properly use the SLsmg screen management routines.
This function is provided only for curses compatibility.
SLsmg_refresh