on modern systems, the ncurses gui crash in wtouchln() or

	wnoutrefresh() [ncurses functions], called from winclose() in menu.c.
	Debunging with gdb showed that wtab->fline was a large negative number.
	Now doing better checking that wtab->fline and wtab->lline is > 0.
	Seems that this fix is sufficient. If it will come out that it is not,
	we'll write a wtouchln() wrapper which checks if the arguments are
	positive and reasonable small.

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