This pipeline is used to modify the HTML body
tag in the private zone, or to add content just after this tag. It is called by the commencer_page()
function that is executed during the display of private zone pages.
$res = pipeline('body_prive',
"<body class='$rubrique $sous_rubrique " . _request('exec') . "'"
. ($GLOBALS['spip_lang_rtl'] ? " dir='rtl'" : "") . '>');