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If the lowest window (eg most recently iconised window) is a hotkey window,
the Wimp used to hang if a keypress was not claimed by any task. Now fixed.
Hotkey events can now be delivered to nested windows.
Ctrl-Alt-Close now closes all windows, at the same nesting level, provided
that they have close buttons.
Ctr-Alt-Iconise now iconises all top-level windows that have close buttons.
Low-res versions of autoscroll pointers fixed: they had been in 256 greys!