Roll-back of node titles as fields. The Entity Translation module in
contrib can add this back, but for everyone else it creates a *huge* WTF.
Apologies for how late this is coming, but better now than post-alpha. :\

#192056 by effulgentsia, Dave Cohen, andypost, hswong3i, geodaniel, pwolanin, and dahacouk: Ensure user's raw login name is never output directly.

- Patch #572618 by effulgentsia, pwolanin, sun: all theme functions should take a single argument. Code clean-up and performance improvement. Woot.

#326539 by JohnAlbin, sun, cha0s, ultimateboy, Rob Loach, Damien Tournoud: Convert 'class' attribute to use an array, not a string.

- Patch #511748 by moshe weitzman: pushing rending to later in the cycle so there is more room for customization.

- Patch #396284 by Berdir, chx, jcfiala, csevb10 et al: make sure to order by table headers first, before ordering by other fields.

- Patch #160226 by Berdir, Dave Reid, karschsp: fixed SQL query in statistics_node_tracker function.

#330983 by recidive and boombatower: Rename users/users_roles tables to user/user_role for consistency.

- Patch #245115 by kkaefer, John Morahan, JohnAlbin et al: after a long discussion we've decided to make the concatenation operator consistent with the other operators.