Log Message:
neomutt: update to 20180223.

2018-02-23  Richard Russon  <rich@flatcap.org>
* Features
  - browser: `<goto-parent>` function bound to "p"
  - editor: `<history-search>` function bound to "Ctrl-r"
  - Cygwin support: https://www.neomutt.org/distro/cygwin
  - OpenSUSE support: https://www.neomutt.org/distro/suse
  - Upstream Homebrew support: Very soon - https://www.neomutt.org/distro/homebrew
* Bug Fixes
  - gmail server-size search
  - nested-if: correctly handle "<" and ">" with %?
  - display of special chars
  - lua: enable myvars
  - for pgpewrap in default gpg.rc
  - reply_regexp which wasn't formatted correctly.
  - parsing of urls containing '?'
  - out-of-bounds read in mutt_str_lws_len
* Translations
  - Review fuzzy lt translations
  - Updated French translation
* Website
  - Installation guide for Cygwin
  - Installation guide for OpenSUSE
  - Installation guide for CRUX
* Build
  - check that DTDs are installed
  - autosetup improvements
  - option for which version of bdb to use
  - drop test for resizeterm -- it's always present
* Code
  - split if's containing assignments
  - doxygen: add/improve comments
  - rename functions / parameters for consistency
  - add missing {}s for clarity
  - move functions to library
  - reduce scope of variables
  - boolify more variables
  - iwyu: remove unnecessary headers
  - name unicode chars
  - tailq: migrate parameter api
  - md5: refactor and tidy
  - rfc2047: refactor and tidy
  - buffer: improvements
  - create unit test framework
  - fix several coverity defects
* Upstream
  - Fix s/mime certificate deletion bug
  - Disable message security if the backend is not available
  - Fix improper signed int conversion of IMAP uid and msn values
  - Change imap literal counts to parse and store unsigned ints
  - Fix imap status count range check
  - cmd_handle_fatal: make error message a bit more descriptive
  - Create pgp and s/mime default and sign_as key vars
  - Add missing setup calls when resuming encrypted drafts
  - mutt_pretty_size: show real number for small files
  - examine_directory: set directory/symlink size to zero
  - Add history-search function, bound to ctrl-r
  - Avoid a potential integer overflow if a Content-Length value is huge