[PATCH]: Optional explanation for options

[Aaron Bentley]

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Robert Collins wrote:
> Good, in which case, I think we should put the description on the
> options and argument definitions, NOT on the commands.

I think Martin is becoming disenchanted with the notion of global
options.  I think even if there are global explanations, it would be
better if we could customize them for particular commands, if desired.

For example, the --revision parameter of bzr merge should probably have
a customized explanation.

Aaron
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