Merge branch 'bw/config-lift-variable-name-length-limit' into maint

The configuration parser had an unnecessary hardcoded limit on
variable names that was not checked consistently.

* bw/config-lift-variable-name-length-limit:
  Remove the hard coded length limit on variable names in config files
Merge branch 'jc/test-say-color-avoid-echo-escape' into maint

The "say" function in the test scaffolding incorrectly allowed
"echo" to interpret "\a" as if it were a C-string asking for a BEL
output.

* jc/test-say-color-avoid-echo-escape:
  test-lib: Fix say_color () not to interpret \a\b\c in the message
Merge branch 'da/mergetools-p4' into maint

"git mergetool" feeds /dev/null as a common ancestor when dealing
with an add/add conflict, but p4merge backend cannot handle it. Work
it around by passing a temporary empty file.

* da/mergetools-p4:
  mergetools/p4merge: Handle "/dev/null"
Merge branch 'jc/grep-pcre-loose-ends' (early part) into maint

"git log -F -E --grep='<ere>'" failed to use the given <ere>
pattern as extended regular expression, and instead looked for the
string literally.

* 'jc/grep-pcre-loose-ends' (early part):
  log --grep: use the same helper to set -E/-F options as "git grep"
  revisions: initialize revs->grep_filter using grep_init()
  grep: move pattern-type bits support to top-level grep.[ch]
  grep: move the configuration parsing logic to grep.[ch]
  builtin/grep.c: make configuration callback more reusable
Merge branch 'nd/grep-true-path' into maint

"git grep -e pattern <tree>" asked the attribute system to read
"<tree>:.gitattributes" file in the working tree, which was
nonsense.

* nd/grep-true-path:
  grep: stop looking at random places for .gitattributes
Merge branch 'rs/branch-del-symref' into maint

A symbolic ref refs/heads/SYM was not correctly removed with "git
branch -d SYM"; the command removed the ref pointed by SYM instead.

* rs/branch-del-symref:
  branch: show targets of deleted symrefs, not sha1s
  branch: skip commit checks when deleting symref branches
  branch: delete symref branch, not its target
  branch: factor out delete_branch_config()
  branch: factor out check_branch_commit()
Merge branch 'mm/maint-doc-remote-tracking' into maint

Update "remote tracking branch" in the documentation to
"remote-tracking branch".

* mm/maint-doc-remote-tracking:
  Documentation: remote tracking branch -> remote-tracking branch
Merge branch 'ph/pull-rebase-detached' into maint

"git pull --rebase" run while the HEAD is detached tried to find
the upstream branch of the detached HEAD (which by definition
does not exist) and emitted unnecessary error messages.

* ph/pull-rebase-detached:
  git-pull: Avoid merge-base on detached head
Merge branch 'po/maint-refs-replace-docs' into maint

The refs/replace hierarchy was not mentioned in the
repository-layout docs.

* po/maint-refs-replace-docs:
  Doc repository-layout: Show refs/replace
Merge branch 'sz/maint-curl-multi-timeout' into maint

Sometimes curl_multi_timeout() function suggested a wrong timeout
value when there is no file descriptors to wait on and the http
transport ended up sleeping for minutes in select(2) system call.  A
workaround has been added for this.

* sz/maint-curl-multi-timeout:
  Fix potential hang in https handshake
Start preparing for 1.8.0.1

Signed-off-by: Junio C Hamano <gitster@pobox.com>
Sync with maint