Merge branch 'bb/unicode-9.0' into maint

The character width table has been updated to match Unicode 9.0

* bb/unicode-9.0:
unicode_width.h: update the width tables to Unicode 9.0
update_unicode.sh: remove the plane filter
update_unicode.sh: automatically download newer definition files
update_unicode.sh: pin the uniset repo to a known good commit
update_unicode.sh: remove an unnecessary subshell level
update_unicode.sh: move it into contrib/update-unicode

diff --combined .gitignore
index 05cb58a3d4ef47295fa8ef02add44a0f0dd90d1f,203703a4929f5ade65f77889e1055c1c979b9d14..6722f78f9ab7e9647a3358a52e627f1c9e83f685
--- 1/.gitignore
--- 2/.gitignore
+++ b/.gitignore
@@@ -155,7 -155,6 +155,7 @@@
  /git-status
  /git-stripspace
  /git-submodule
 +/git-submodule--helper
  /git-svn
  /git-symbolic-ref
  /git-tag
@@@ -172,13 -171,42 +172,13 @@@
  /git-verify-tag
  /git-web--browse
  /git-whatchanged
 +/git-worktree
  /git-write-tree
  /git-core-*/?*
  /gitweb/GITWEB-BUILD-OPTIONS
  /gitweb/gitweb.cgi
  /gitweb/static/gitweb.js
  /gitweb/static/gitweb.min.*
 -/test-chmtime
 -/test-ctype
 -/test-config
 -/test-date
 -/test-delta
 -/test-dump-cache-tree
 -/test-dump-split-index
 -/test-scrap-cache-tree
 -/test-genrandom
 -/test-hashmap
 -/test-index-version
 -/test-line-buffer
 -/test-match-trees
 -/test-mergesort
 -/test-mktemp
 -/test-parse-options
 -/test-path-utils
 -/test-prio-queue
 -/test-read-cache
 -/test-regex
 -/test-revision-walking
 -/test-run-command
 -/test-sha1
 -/test-sha1-array
 -/test-sigchain
 -/test-string-list
 -/test-subprocess
 -/test-svn-fe
 -/test-urlmatch-normalization
 -/test-wildmatch
  /common-cmds.h
  *.tar.gz
  *.dsc
@@@ -203,7 -231,6 +203,6 @@@
  /config.mak.autogen
  /config.mak.append
  /configure
- /unicode
  /tags
  /TAGS
  /cscope*