[sugar] replace/normalize some keyboard shortcuts

[Benjamin M. Schwartz]

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Mikus Grinbergs wrote:
| Eben wrote:
|> I'm certainly all for removing alt-n and alt-p.  We don't need
|> redundant shortcuts here, and alt-tab and alt-shift-tab will work fine
|
| I disagree with alt-n and alt-p not considered useful.  Either can
| be done using TWO fingers.  Needing three fingers for backwards-tab
| navigation is quite awkward for me.

This is why I like Eben's suggestion of having F4 and Shift-F4 cycle
activities.

- --Ben
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