Merge "(bug 12701) Use diff of all unseen revisions in the "new messages" bar."

diff --cc includes/Skin.php
Simple merge

diff --cc includes/Title.php
Simple merge

diff --cc includes/User.php
Simple merge

diff --cc includes/WikiPage.php
Simple merge

diff --cc languages/messages/MessagesEn.php
Simple merge

diff --cc languages/messages/MessagesQqq.php
Simple merge

diff --cc maintenance/language/messages.inc
Simple merge