[sugar] frame auto-visibility configuration

[Benjamin M. Schwartz]

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Erik Garrison wrote:
| Hello all,
|
| On tabbing we are currently auto-toggling the frame.  Are we sure that
| this is necessary?  Could we include a configuration option to change
| this?
|

Another option, which I would prefer, is to show only the top bar of the
frame.  In general, when only one of the four sides of the frame is
relevant, I think we should show only that side.

Showing only the top bar should save something like 75% of the redraw CPU,
while retaining the helpful display of available instances.

- --Ben
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