More fixes to Selva. Also rewrote the control-panel page to include the bits of acs-subsite/www/pvt/home we (Carl, Olga, Emma, Daveb, me) like. Removed the "My Account" link since we've got the bits we like right on the page.
Added "home" message key and used it. Fixed community/classes tabs (by editing dotlrn-main-portlet, whose default behavior is unchanged). Made subgroups show "Subgroup" left tab in Selva. Other changes that escape my mind at the moment.