Update of unicode_width.h to Unicode Version 7.0

Unicode Version 7.0 was released yesterday.
Run ./update_unicode.sh to update the zero_width table.
Note: the double_width is unchanged.

Signed-off-by: Torsten Bögershausen <tboegi@web.de>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
refs.c: SSE2 optimizations for check_refname_component

Optimize check_refname_component using SSE2 on x86_64.

git rev-parse HEAD is a good test-case for this, since it does almost
nothing except parse refs.  For one particular repo with about 60k
refs, almost all packed, the timings are:

Look up table: 29 ms
SSE2:          23 ms

This cuts about 20% off of the runtime.

Ondřej Bílka <neleai@seznam.cz> suggested an SSE2 approach to the
substring searches, which netted a speed boost over the SSE4.2 code I
had initially written.

Signed-off-by: David Turner <dturner@twitter.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Merge branch 'tb/unicode-7.0-display-width' into jch

* tb/unicode-7.0-display-width:
  Update of unicode_width.h to Unicode Version 7.0
Merge branch 'dt/refs-check-refname-component-sse' into jch

* dt/refs-check-refname-component-sse:
  refs.c: SSE2 optimizations for check_refname_component
Merge branch 'rh/prompt-tests' into pu

to be broken with older zsh that are still in the field ($gmane/251231).

* rh/prompt-tests:
  t9904: new __git_ps1 tests for Zsh
  test-lib: make it possible to override how test code is eval'd
  lib-prompt-tests.sh: add variable for string that encodes percent in PS1
  lib-prompt-tests.sh: put all tests inside a function
  t9903: move prompt tests to a new lib-prompt-tests.sh file
  t9903: move PS1 color code variable definitions to lib-bash.sh
  t9903: include "Bash" in test names via new $shellname var
  t9903: run pc mode tests again with PS1 expansion disabled
  t9903: move test name prefix to a separate variable
  t9903: put the Bash pc mode prompt test cases in a function
  t9903: remove Zsh test from the suite of Bash prompt tests
Merge branch 'nd/multiple-work-trees' into pu

A replacement for contrib/workdir/git-new-workdir that does not
rely on symbolic links and make sharing of objects and refs safer
by making the borrowee and borrowers aware of each other.

* nd/multiple-work-trees: (28 commits)
  count-objects: report unused files in $GIT_DIR/repos/...
  gc: support prune --repos
  gc: style change -- no SP before closing bracket
  prune: strategies for linked checkouts
  checkout: detach if the branch is already checked out elsewhere
  checkout: clean up half-prepared directories in --to mode
  checkout: support checking out into a new working directory
  use new wrapper write_file() for simple file writing
  wrapper.c: wrapper to open a file, fprintf then close
  setup.c: support multi-checkout repo setup
  setup.c: detect $GIT_COMMON_DIR check_repository_format_gently()
  setup.c: convert check_repository_format_gently to use strbuf
  setup.c: detect $GIT_COMMON_DIR in is_git_directory()
  setup.c: convert is_git_directory() to use strbuf
  git-stash: avoid hardcoding $GIT_DIR/logs/....
  *.sh: avoid hardcoding $GIT_DIR/hooks/...
  git-sh-setup.sh: use rev-parse --git-path to get $GIT_DIR/objects
  $GIT_COMMON_DIR: a new environment variable
  commit: use SEQ_DIR instead of hardcoding "sequencer"
  fast-import: use git_path() for accessing .git dir instead of get_git_dir()
  ...

# Conflicts:
# 	builtin/checkout.c
# 	builtin/repack.c
# 	refs.c
# 	refs.h
Merge branch 'mh/lockfile' into pu

Refactor and fix corner-case bugs in the lockfile API, all looked
sensible.

* mh/lockfile: (25 commits)
  trim_last_path_elm(): replace last_path_elm()
  resolve_symlink(): take a strbuf parameter
  resolve_symlink(): use a strbuf for internal scratch space
  change lock_file::filename into a strbuf
  commit_lock_file(): use a strbuf to manage temporary space
  try_merge_strategy(): use a statically-allocated lock_file object
  try_merge_strategy(): remove redundant lock_file allocation
  struct lock_file: declare some fields volatile
  lockfile: avoid transitory invalid states
  commit_lock_file(): die() if called for unlocked lockfile object
  commit_lock_file(): inline temporary variable
  remove_lock_file(): call rollback_lock_file()
  lock_file(): exit early if lockfile cannot be opened
  write_packed_entry_fn(): convert cb_data into a (const int *)
  prepare_index(): declare return value to be (const char *)
  delete_ref_loose(): don't muck around in the lock_file's filename
  cache.h: define constants LOCK_SUFFIX and LOCK_SUFFIX_LEN
  lockfile.c: document the various states of lock_file objects
  lock_file(): always add lock_file object to lock_file_list
  hold_lock_file_for_append(): release lock on errors
  ...
Merge branch 'bg/rebase-off-of-previous-branch' into pu

Teach "git rebase -" to report the concrete name of the branch
(i.e. the previous one).

But it stops short and does not do the same for "git rebase @{-1}".

* bg/rebase-off-of-previous-branch:
  git-rebase: print name of rev when using shorthand
Merge branch 'nd/split-index' into pu

* nd/split-index: (32 commits)
  t1700: new tests for split-index mode
  t2104: make sure split index mode is off for the version test
  read-cache: force split index mode with GIT_TEST_SPLIT_INDEX
  read-tree: note about dropping split-index mode or index version
  read-tree: force split-index mode off on --index-output
  rev-parse: add --shared-index-path to get shared index path
  update-index --split-index: do not split if $GIT_DIR is read only
  update-index: new options to enable/disable split index mode
  split-index: strip pathname of on-disk replaced entries
  split-index: do not invalidate cache-tree at read time
  split-index: the reading part
  split-index: the writing part
  read-cache: mark updated entries for split index
  read-cache: save deleted entries in split index
  read-cache: mark new entries for split index
  read-cache: split-index mode
  read-cache: save index SHA-1 after reading
  entry.c: update cache_changed if refresh_cache is set in checkout_entry()
  cache-tree: mark istate->cache_changed on prime_cache_tree()
  cache-tree: mark istate->cache_changed on cache tree update
  ...

# Conflicts:
# 	builtin/merge.c
# 	lockfile.c
# 	read-cache.c
Merge branch 'po/everyday-doc' into pu

This may make the said command to emit something, but the source is
not meant to be formatted into a manual pages to begin with, and
also its contents are a bit stale.  It may be a good first step in
the right direction, but needs more work to at least get the
mark-up right before public consumption.

Will hold.

* po/everyday-doc:
  Make 'git help everyday' work

# Conflicts:
# 	Documentation/Makefile
Merge branch 'rb/merge-prepare-commit-msg-hook' into pu

Expose more merge states (e.g. $GIT_DIR/MERGE_MODE) to hooks that
run during "git merge".  The log message stresses too much on one
hook, prepare-commit-msg, but it would equally apply to other hooks
like post-merge, I think.

* rb/merge-prepare-commit-msg-hook:
  merge: drop unused arg from abort_commit method signature
  merge: make prepare_to_commit responsible for write_merge_state
  t7505: ensure cleanup after hook blocks merge
  t7505: add missing &&

# Conflicts:
# 	builtin/merge.c
# 	t/t7505-prepare-commit-msg-hook.sh
Merge branch 'jc/show-branch' into pu

* jc/show-branch:
  show-branch: use commit slab to represent bitflags of arbitrary width
  show-branch.c: remove "all_mask"
  show-branch.c: abstract out "flags" operation
  show-branch.c: lift all_mask/all_revs to a global static
  show-branch.c: update comment style
Merge branch 'tr/merge-recursive-index-only' into pu

Will hold.

* tr/merge-recursive-index-only:
  merge-recursive: -Xindex-only to leave worktree unchanged
  merge-recursive: internal flag to avoid touching the worktree
  merge-recursive: remove dead conditional in update_stages()
Merge branch 'tg/perf-lib-test-perf-cleanup' into pu

Add test_perf_cleanup shell function to the perf suite, that allows
the script writers to define a test with a clean-up action.

Will hold.

* tg/perf-lib-test-perf-cleanup:
  perf-lib: add test_perf_cleanup target
  perf-lib: split starting the test from the execution
Merge branch 'jh/submodule-tests' into pu

More or less abandoned.  Will drop.

* jh/submodule-tests:
  t7410: 210 tests for various 'git submodule update' scenarios
Merge branch 'ab/add-interactive-show-diff-func-name' into pu

* ab/add-interactive-show-diff-func-name:
  SQUASH??? git-add--interactive: Preserve diff heading when splitting hunks
  git-add--interactive: Preserve diff heading when splitting hunks
Merge branch 'ss/userdiff-update-csharp-java' into pu

Reviews sent; waiting for a response.

* ss/userdiff-update-csharp-java:
  userdiff: support Java try keyword
  userdiff: support C# async methods and correct C# keywords
Merge branch 'jn/gitweb-utf8-in-links' into pu

$gmane/250758?

* jn/gitweb-utf8-in-links:
  gitweb: Harden UTF-8 handling in generated links
Merge branch 'jl/gitk-show-added-submodule-changes' into pu

* jl/gitk-show-added-submodule-changes:
  gitk: show staged submodules regardless of ignore config
  l10n: Init Vietnamese translation
Merge branch 'jl/git-gui-show-added-submodule-changes' into pu

Tentatively queued what I expect to receive via Pat Thoyts.

* jl/git-gui-show-added-submodule-changes:
  git-gui: show staged submodules regardless of ignore config