[MERGE] concise help for commands by default

[Ian Clatworthy]

As discussed on the mailing list recently, the help for
commands should be concise by default with "bzr help -v xxx"
being used to see the detailed information.

The attached patch implements that. It also makes sure that
multiple descriptive sections are kept in the order given,
rather than being alphabetically sorted.

After this patch lands, I'll resubmit my "expanded log help"
patch.

Ian C.
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