* Updated cheat commands to work with arbitrary devices and address
spaces. You can still only search RAM areas in a single address space
at a time, but any address space of any device can be used now.
* Made the cheatinit/cheatrange commands not affect current state if the
arguments are invalid. Also fixed some bugs in the cheat commands.
* Updated documentation for cheat commands, and added a simple worked
example. Also added single-sentence descriptions of what
(break|watch|register)points are to the top of the relevant pages.
-frontend improvements:
* Added a bit more info to the about box, moved the VCS revision to the
heading.
* Don't show "not" codes in prompts - they're not helpful.
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