Fix error running timer `wl-biff-event-handler'

Cf. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=768910
Merge pull request #84 from tats/bug/idle-timer

Fix error running timer `wl-biff-event-handler'
Correct argument of run-with-idle-timer for wl-biff

Cf. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=768910
Indentation fix
Correct arguments of idle timer for wl-save-drafts
Merge pull request #85 from tats/bug/idle-timer

Correct arguments of idle timer
Revert the last changes for idle-timer.
wl-util.el (wl-biff-event-handler): Do not skip idle-timer.  Avoid direct access for timer's parameter if possible.
Remove redundant code.
Remove '1' argument for forward-char, backward-char and forward-line.  Use following-char and preceding-char preferredly.
elmo-nntp.el (elmo-nntp-next-result-arrived-p): Simplified.
Use elmo-delete-cr and elmo-delete-cr-buffer.
Fix typo.
Provide correct search key for header searches

* elmo-imap4.el (elmo-imap4-search-generate-vector): Provide correct
  search key for header searches.

There must be a space between `header' and the header name.
add wanderlust-pkg.el for MELPA
support loading icons from icons/ dir in package