[PATCH] allow to not sort the search results

[Jason White]

Sebastian Spaeth <Sebastian at SSpaeth.de> wrote:
> previously we were always sorting the returned results by some string value,
> but sometimes we might just be interested in the number of results, and don't
> need any sorting.
> 
> Also add a --sort=unsorted command line option to notmuch search to test this.

Does this provide relevance-ranked search results? I think relevance ranking
is the Xapian default if a sort order isn't specified. 

It would be useful to be able to obtain a relevance-ranked list of messages or
threads that satisfy a query.