patches for 0.4

[David Edmondson]

This is a set of small feature and cleanup patches. The only
particularly significant one is patch 2, as it fixes a memory
corruption bug in notmuch.

dme.

[PATCH 01/13] emacs: Usability improvements for `notmuch-hello'.
[PATCH 02/13] notmuch: Fix off-by-one errors if a header is >200 characters long.
[PATCH 03/13] emacs: Adjust comment to avoid confusing font-lock.
[PATCH 04/13] emacs: Display non-matching authors with a different face.
[PATCH 05/13] emacs: Set the `face' property rather than `font-lock-face'.
[PATCH 06/13] emacs: Allow control over faces for search mode columns.
[PATCH 07/13] emacs: Allow tuning of the tag/saved search layout.
[PATCH 08/13] emacs: Reuse rather than reinvent message header filtering
[PATCH 09/13] emacs: Avoid runtime use of `cl'.
[PATCH 10/13] emacs: In search mode, truncate authors using invisible text.
[PATCH 11/13] emacs: Pretty print the numbers of matching messages.
[PATCH 12/13] emacs: Tags should be shown with `notmuch-tag-face'.
[PATCH 13/13] emacs: Allow the display of absolute dates in the header line.