Log Message:
Update to 2.10.1, provided by Kouichirou Hiratsuka in PR 26956.

Changes since 2.10.0:
* Changes in 2.10.1 from 2.10.0
  Version 2.10.1 is a bug fix version of 2.10.0.

** Fixed after message buffer kill, prefetch doesn't work.

** Default value of wl-delete-folder-alist,
   wl-folder-hierarchy-access-folders are changed.

** Support localdir and pipe folder rename.

** Fixed message and error argument. Use %s for variable.

** Now, response from IMAP server (e.g. \Noselect, \Flagged)
   parse case-ignore.

** Fixed elmo-msgdb-extra-fields field are case sensitive.

** Fixed IMAP folder included ~, expand to home directory.

** Fixed the problem that msgdb be destroyed when print-length or
   print-level has Non-nil value.

** Fixed a problem that wl-folder-move-cur-folder doesn't work.

** Fixed a problem that wl-draft-reedit doesn't work properly on Meadow.

** Fixed a problem that wl-summary-pack-number doesn't work on
   Maildir, shimbun, and pipe folders.

** Fixed a problem that cache file is not protected even if it is marked
   as important.

** Fixed a problem that %# in wl-summary-line-format cannot handle large
   number.

** Fixed a problem to remove password even if SMTP AUTH failed at non-auth
   phase.

** Default value of wl-message-buffer-prefetch-folder-type-list,
   wl-message-buffer-prefetch-idle-time, and
   wl-message-buffer-prefetch-depth are changed.

** Fixed to compile on XEmacs without mule feature.