[tabs] provide a working tabs implementation, that lazy-loads tab content & should remember the current position
function set_tab(tabname) {
// set appropriate cookie
// XXX see if we can no just do it with jQuery
async_remote_exec('remember_active_tab', tabname);
// trigger show + tabname event
log('set tab for ' + jQuery('#lazy-' + tabname).attr('cubicweb:loadurl'));
trigger_load(tabname);
}