elmo-util.el (elmo-max-of-list): Refactored.
elmo-util.el (elmo-max-of-list, elmo-cache-get-path-subr, elmo-warning): Explicit function's symbols.
elmo-util.el (elmo-max-of-list): Fix the last change for the case argument is nil.
Improve performance of uniquifying large list of sortable numbers.
wl-summary.el (wl-summary-default-subject-filter): Minor refactoring.
Keep multiple parent Message-IDs in msgdb.
elmo-util.el (elmo-list-diff): Simplified.  Sort each element of return value.
wl-summary.el (wl-summary-insert-thread): Report progress.
Merged from upstream.
Merge branch 'master' of git://github.com/wanderlust/wanderlust
elmo-imap4.el (elmo-imap4-setup-send-buffer): Fix typo.  Bind inhibit-eol-conversion to nil before code conversion.
elmo-pop3.el (elmo-pop3-read-body): Fix trying to access buffer local variable from another buffer.
Check references field's value by user.
Use draft folder petname if defined

* wl-draft.el (wl-draft-save, wl-draft-reedit,
  wl-draft-buffer-change-number): Use draft folder petname if defined.
* wl-util.el (wl-collect-draft): Use draft folder petname if defined.

Patch provided by Markus Huber in
<mid:2014052108:51:07markus.huber@informatik.uni-augsburg.de>.
Add the comment for old msgdb.
Fix digest flag search for IMAP and NNTP folders.
Update elmo-file so it works with modern versions of the file utility.

This uses "file -i" instead of "file -m".  Additionally, if file is kind
enough to provide a charset, we trust the result and avoid decoding and
recoding the data multiple times.
Fix typo in elmo-map-folder-list-message-locations (elmo-file-folder).

Due to a missing expand-file-name, we were including subdirectories,
which caused searches to fail.
Merge remote-tracking branch 'ikazuhiro/master'

Conflicts:
	wl/ChangeLog
Signal error if maildir message file is not found

* elmo-maildir.el (elmo-map-message-fetch): Signal error if maildir
  message file is not found.