Log Message:
Changed 1.8.0.1
* The configuration parser had an unnecessary hardcoded limit on
  variable names that was not checked consistently.
* 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.
* "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.
* "git log -F -E --grep='<ere>'" failed to use the given <ere>
  pattern as extended regular expression, and instead looked for the
  string literally.
* "git grep -e pattern <tree>" asked the attribute system to read
  "<tree>:.gitattributes" file in the working tree, which was
  nonsense.
* A symbolic ref refs/heads/SYM was not correctly removed with "git
  branch -d SYM"; the command removed the ref pointed by SYM
  instead.
* Earlier we fixed documentation to hyphenate "remote-tracking branch"
  to clarify that these are not a remote entity, but unhyphenated
  spelling snuck in to a few places since then.
* "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.
* The refs/replace hierarchy was not mentioned in the
  repository-layout docs.
* 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.
* Various rfc2047 quoting issues around a non-ASCII name on the
  From: line in the output from format-patch have been corrected.
* "git diff -G<pattern>" did not honor textconv filter when looking
  for changes.
* Bash completion script (in contrib/) did not correctly complete a
  lazy "git checkout $name_of_remote_tracking_branch_that_is_unique"
  command line.
* RSS feed from "gitweb" had a xss hole in its title output.
* "git config --path $key" segfaulted on "[section] key" (a \ 
boolean
  "true" spelled without "=", not "[section] key = \ 
true").
* "git checkout -b foo" while on an unborn branch did not say
  "Switched to a new branch 'foo'" like other cases.
Also contains other minor fixes and documentation updates.