Updated neomutt to 20160820.

2016-08-19  Richard Russon  <rich@flatcap.org>
* Contrib
  - Updates to Keybase Support
    Joshua Jordi (JakkinStewart)
* Bug Fixes
  - Fix data-loss when appending a compressed file
  - Don't paint invisible progress bars
  - Revert to Mutt keybindings
  - Don't de-tag emails after labelling them
  - Don't whine if getrandom() fails
    Adam Borowski (kilobyte)
  - Fix display when 'from' field is invalid
* Config
  - Support for $XDG_CONFIG_HOME and $XDG_CONFIG_DIRS
    Marco Hinz (mhinz)
* Docs
  - Fix DocBook validation
  - Document NotMuch queries
* Build
  - More Autoconf improvements
    Darshit Shah (darnir)
  - Create Distribution Tarballs with autogen sources
    Darshit Shah (darnir)

2016-08-08  Richard Russon  <rich@flatcap.org>
* New Features
  - Timeout Hook - Run a command periodically
  - Multiple fcc - Save multiple copies of outgoing mail
* Contrib
  - Keybase Integration
    Joshua Jordi (JakkinStewart)
* Devel
  - Attached - Prevent missing attachments
    Darshit Shah (darnir)
  - Virtual Unmailboxes - Remove unwanted virtual mailboxes
    Richard Russon (flatcap)
* Bug Fixes
  - Sidebar's inbox occasionally shows zero/wrong value
  - Fix crash opening a second compressed mailbox
* Config
  - Look for /etc/NeoMuttrc and ~/.neomuttrc
* Docs
  - Fix broken links, typos
  - Update project link
  - Fix version string in the manual
* Build
  - Add option to disable fmemopen
  - Install all the READMEs and contribs
  - Big overhaul of the build
    Darshit Shah (darnir)


(wiz)