Revert class cruft in r43327 :)

Revert class cruft in r43327 :)
I think I'd rather see consistent classes for common UI elements, regardless of where they appear.
For instance 'mw-rc-usertoollinks' ... We have user tool links in a hojillion places; they should all have *the same* class. If you need to distinguish those on RC from those on another page, you use a fancier selector that grabs only those in the special you want.