Sebastien Helleu 0d8bd7f1e6 core: add option weechat.look.day_change_message2
The new option weechat.look.day_change_message2 is used to display day change
between two messages, with two dates: the new one, and the old one.

Example:

-- Mon, 02 Sep 2013 (Thu, 22 Aug 2013) --
2013-09-02 08:39:06 +02:00
..