* mi-interp.c (mi_event_handlers): Add selected_frame_level_changed

    * mi-interp.c (mi_event_handlers): Add selected_frame_level_changed
        handler.
        (mi_insert_notify_hooks): Remove breakpoint hooks and frame
        changed hook.
        (mi_remove_notify_hooks): Likewise.
        * mi-events.c (mi_selected_frame_level_changed): New function.
        (mi_interp_frame_changed_hook): Remove.
        (mi_interp_create_breakpoint_hook): Remove.
        (mi_interp_modify_breakpoint_hook): Remove.
        (mi_interp_delete_breakpoint_hook): Remove.
        * mi.h (mi_selected_frame_level_changed): Add declaration.
        (mi_interp_create_breakpoint_hook): Remove declaration.
        (mi_interp_modify_breakpoint_hook): Remove declaration.
        (mi_interp_delete_breakpoint_hook): Remove declaration.
        * mi-cmd-stack.c (mi_cmd_stack_select_frame): If the stack level changes,
        issue a selected_frame_level_changed event.