Merge branch 'jk/version-string' into next

Teaches git native protocol agents to show software version over the
wire.

* jk/version-string:
  http: get default user-agent from git_user_agent
  version: add git_user_agent function
  move git_version_string into version.c
Merge branch 'jk/clone-local' into next

"git clone --local $path" started its life as an experiment to
optionally use link/copy when cloning a repository on the disk, but
we didn't deprecate it after we made the option a no-op to always
use the optimization.

* jk/clone-local:
  clone: allow --no-local to turn off local optimizations
  docs/clone: mention that --local may be ignored
Merge branch 'jk/no-more-asciidoc7' into next

We no longer use AsciiDoc7 syntax in our documentation and favor a
more modern style.

* jk/no-more-asciidoc7:
  docs: drop antique comment from Makefile
  docs: drop asciidoc7compatible flag
Merge branch 'jc/request-pull-match-tagname' into next

"git request-pull $url dev" when the tip of "dev" branch was tagged
with "ext4-for-linus" used the contents from the tag in the output
but still asked the "dev" branch to be pulled, not the tag.

* jc/request-pull-match-tagname:
  request-pull: really favor a matching tag
Merge branch 'jc/bundle-complete-notice' into next

Running "git bundle verify" on a bundle that records a complete
history said "it requires these 0 commits".

* jc/bundle-complete-notice:
  tweak "bundle verify" of a complete history
Merge branch 'vr/help-per-platform' into next

We used to always default to "man" format even on platforms where
"man" viewer is not widely available.

* vr/help-per-platform:
  help: use HTML as the default help format on Windows
Merge branch 'jk/maint-t1304-setfacl' into next

Works around a false test failure caused by a bug in ecryptofs.

* jk/maint-t1304-setfacl:
  t1304: improve setfacl prerequisite setup
Merge branch 'jc/ls-files-i-dir' into next

"git ls-files --exclude=t -i" did not consider anything under t/
as excluded, as it did not pay attention to exclusion of leading
paths while walking the index.  Other two users of excluded() are
also updated.

* jc/ls-files-i-dir:
  dir.c: make excluded() file scope static
  unpack-trees.c: use path_excluded() in check_ok_to_remove()
  builtin/add.c: use path_excluded()
  path_excluded(): update API to less cache-entry centric
  ls-files -i: micro-optimize path_excluded()
  ls-files -i: pay attention to exclusion of leading paths
Merge branch 'jk/blame-tree' into HEAD

* jk/blame-tree:
  blame-tree wip
Merge branch 'jk/builtin-attr' into HEAD

* jk/builtin-attr:
  attr: map builtin userdiff drivers to well-known extensions
Merge branch 'jk/bundle-fetch' into HEAD

* jk/bundle-fetch:
  clone: give advice on how to resume a failed clone
  remote-curl: resume interrupted bundle transfers
  remote-curl: show progress for bundle downloads
  progress: allow pure-throughput progress meters
  remote-curl: try base $URL after $URL/info/refs
  remote-curl: auto-detect bundles when fetching refs
  remote-curl: free "discovery" object
  bundle: add is_bundle_buf helper
  transport: factor out bundle to ref list conversion
  remote-curl: use http callback for requesting refs
  http: add a public function for arbitrary-callback request
  http: refactor http_request function
  http: turn off curl signals
  t/lib-httpd: check for NO_CURL
Merge branch 'jk/cache-patch-id' into HEAD

* jk/cache-patch-id:
  cache patch ids on disk
  cherry: read default config
  implement metadata cache subsystem
  map: implement persistent maps
  decorate: use "map" for the underlying implementation
  fast-export: use object to uint32 map instead of "decorate"
  implement generic key/value map
Merge branch 'jk/child-cleanup' into HEAD

* jk/child-cleanup:
  send-pack: kill pack-objects helper on signal or exit
Merge branch 'jk/clone-file-local' into HEAD

* jk/clone-file-local:
  clone: send diagnostic messages to stderr
  clone: allow --no-local to turn off local optimizations
  docs/clone: mention that --local may be ignored
Merge branch 'jk/config-sources' into HEAD

* jk/config-sources:
  show sources of config options (WIP)
Merge branch 'jk/describe' into HEAD

* jk/describe:
  describe WIP
Merge branch 'jk/diff-pager' into HEAD

* jk/diff-pager:
  do not run pager with diff --no-index --quiet
  fix pager.diff with diff --no-index
Merge branch 'jk/doc-links-fix' into HEAD

* jk/doc-links-fix:
  docs: always define git-relative-html-prefix attribute
Merge branch 'jk/dumpstat' into HEAD

* jk/dumpstat:
  zeromq dumpstat implementation
  dumpstat-ify upload-pack
  dumpstat to fd
  dumpstat
Merge branch 'jk/external-odb' into HEAD

* jk/external-odb:
  fetch-pack: advertise external odb blobs
  external odb foreach
  external odb work in progress