irc: add option irc.look.notice_welcome_redirect to automatically redirect channel welcome notices to the channel buffer
core: fix automatic scroll to bottom of buffer when day change is displayed before first line of buffer
translation: update
Merge branch 'master' of git://git.sv.gnu.org/weechat

Conflicts:
	po/ja.po
irc: fix extraction of channel name in notice (when message starts with "[]")
doc: update japanese translations and docs
doc: use one line titles in japanese man page

The compilation was failing with asciidoc 8.5.2 (on Debian Squeeze).
Merge branch 'master' of git://git.sv.gnu.org/weechat

Conflicts:
	po/ja.po
Merge branch 'master' of git://git.sv.gnu.org/weechat