[sql generation] fix missing join with outer joins w/ rhs invariant variable... ... where the principal where not the processed relation. This led to major refactoring in outer join handling, which is now much clearer and powerful. Closes #1579228

$(document).ready(function() {
    $('a.rhythm').click(function (event){
        $('div#pageContent').toggleClass('rhythm_bg');
        $('div#page').toggleClass('rhythm_bg');
        event.preventDefault();
    });
});