RedrawScreen — Redraws the screen
Redraws the screen after it very likely has become garbled by some other output.
This should normally not be necessary: The (specific) UI redraws the screen automatically whenever required. Under rare circumstances, however, the screen might have changes due to circumstances beyond the UI's control: For text based UIs, for example, system commands that cause output to every tty might make this necessary. Call this in the YCP code after such a command.