* tuiStack.c: Add missing includes.

	* tuiStack.c: Add missing includes.
	(tuiShowFrameInfo): Don't crash when there is no symbol table
	associated with the pc.
	* tuiSource.c (_hasBreak): Check for null source file.
	* tuiWin.c (tuiRefreshAll): Check for null winList[type].
	(_tuiSetFocus): Check for null dataWin.
	* tuiGeneralWin.c (refreshAll): Check for null list[type].