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

Authored by lupo <lupo.bugzilla@gmail.com>.

Description

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

Also pluralize properly.

"You have a new message from another user (last change)"
if only one unseen revision, or
"You have new messages [from another user|from N users|]
(last changes)" if there are several unseen revisions.

Contains a fix in Title::countAuthorsBetween() adding options to include
(one or both of) the delimiting revisions in the count.

Change-Id: I8870111802085d0bd188cb508c4f4b852985634d