Sorry about the subject spam in that first message

Backstory: When I switched to a newer 0.12 build the function I was
using at the time stopped letting me tag messages while in search
mode. notmuch-search-remove-tag had been changed to take 0
arguments. Old function:

> (defun notmuch-search-delete ()
>   "Remove 'unread' tag"
>   (interactive)
>   (notmuch-search-remove-tag "unread")
>   (forward-line))
>
> (define-key notmuch-search-mode-map "u" 'notmuch-search-delete)
 
I don't typically go into threads to mark them unread. But that
kind of functionality is all I could find on the updated emacstips, lots
of "notmuch-show-*" functions. [0]

This patch tries to remedy that by introducing a function,
notmuch-search-tag-and-advance which allows you to apply a number of
tags at once to the current thread under the point --
non-interactively. It follows the form of the
notmuch-search-archive-thread function.

This github gist [1] is a .el file that I load with notmuch. It includes
the new defun in full and demonstrates how to use it in a custom
function mapped to a key.

If this patch is accepted I would be happy to hash-out something to add
to the emacs tips docs.


[0] http://notmuchmail.org/emacstips/#index6h2
[1] https://gist.github.com/1996899

-- 
Tim Bielawa, Software Engineer/Scribe
Production Control Team (RDU)
919.332.6411 Cell | IRC: tbielawa
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