Updated notmuch to 0.23.7.

Notmuch 0.23.7 (2017-02-28)
===========================

Test Suite
----------

Drop use of gpgconf --create-socketdir. Move $GNUPGHOME to /tmp.

  It turns out the hardcoded use of /run/user in gpg doesn't work out
  that well in some environments. The more low tech fix is to move all
  of $GNUPGHOME to somewhere where we can control the length of the
  paths.

Notmuch 0.23.6 (2017-02-27)
===========================

Command Line Interface
----------------------

Fix read-after-free bug in `notmuch new`.

Test Suite
----------

Use gpgconf --create-socketdir if available.

  GnuPG has a facility to use sockets in /run or /var/run to avoid
  problems with long socket paths, but this is not enabled by default
  for GNUPGHOME other than $HOME/.gnupg. Enable it, if possible.


(wiz)