update top level argument handling

[Jani Nikula]

On Sat, 19 Jan 2013, david at tethera.net wrote:
> The only new feature here is an option --leak-report
> to notmuch new, as requested in id:m2hangivfu.fsf at guru.guru-group.fi
>
> There is also a bunch of cleanup of the argument handling. One
> casualty of this is that the use of aliases (in particular "notmuch
> part" and "notmuch search-tags" is no longer supported).

Patches 1-4 look good, and IMO should be used regardless of the
bikeshedding result on patches 5-7.

BR,
Jani.


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