[merge] fix up and enforce style of option help

[Aaron Bentley]

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Martin Pool wrote:
> On 7/11/07, John Arbash Meinel <john at arbash-meinel.com> wrote:
>> John Arbash Meinel has voted +1.
>> Status is now: Approved
>> Comment:
>> Though I think we should complain about options with no help.
> 
> Here's an additional patch that does that, and also:
> * removes orphaned global options

This is an API break.  Those orphaned global options may be in use by
plugins-- for example, "message" is used by "shelve".

Aaron
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