Negating options

[Aaron Bentley]

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Now that command defaults are on the horizon, (or 'here' in my case)
it's usefult to be able to negate boolean options.  I was thinking we
could make '--no' be a special option that would negate the option
following, like:

$ bzr revert --no reprocess --merge-type weave

Thoughts?

Also, should we consider using optparse (perhaps as a backend) now that
our needs are growing more sophisticated?

Aaron
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