* tuiWin.h: Declare the new variables.
* tuiWin.c (_initialize_tuiWin): Create TUI configuration variables.
(tui_update_variables): New function.
(translate): New function.
(tui_border_kind_enums, tui_border_mode_enums): New tables.
(tui_border_mode_translate): New table.
(tui_border_kind_translate_*): New tables.
(tui_active_border_mode): New variables.
(tui_border_*): New variables.
(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].