leave it in the command window.
(tui_redisplay_readline): Save cursor position to restore the
cursor after we go back from background.
* tuiData.h (TuiCommandInfo): Add start_line member.
(TuiGenWinInfo, TuiGenWinInfoPtr): Move from here.
* tuiData.h: To here; include curses includes here.
(setTermHeightTo): Rename of setTermHeight to follow reality.
(setTermWidthTo): Likewise with setTermWidth.