replace call to jQuery to grp.jQuery in login.js
Put additional stylesheets in the stylesheets block instead of extrahead.

Putting them in extrahead collides with the way Filebrowser's FB_TinyMCE
removes the stylesheet TinyMCE automatically adds. By putting additional
stylesheets in the stylesheets block, we avoid getting TinyMCE to add its CSS
on the middle of our own files, that will eventually get removed by the
FB_TinyMCE script.