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README and version number.

Fixes Bug#1036.

Conflicts:

	lib/util.php

I've seen a request or two pop up for this on the Laconica group on
Identica, and I'd personally like there to be a link to the search
page from my own groups listing, as I often find myself looking for
one and end up at my browser's address bar.

Moved the common_avatar_* functions to the Avatar class. Typically
either as methods on the object or as static methods. Replaced all the
uses of the functions in other modules.

form_notice_delete

Made two different functions for file size in ImageFile; one uses the
other.

Also, use sprintf() for gettext msgs.

Conflicts:

	actions/avatarsettings.php

Fix #81: Profile and personal shows „you“ instead of username when looking at own profile / personal. While doing so I fixed a wrong gettext usage were the result was not sprintf'd, but concat'd.

"Rememberme" logins aren't allowed to make changes to an account
(since cookie-stealing is too easy). Users have to re-authenticate.
Previously, it was impossible to do so without having a username and
password; this change lets you do it with OpenID, too.