fix: allow adviser message was not allowing cookies to be sent

fix: cookie deletion on logout uses ini_get (on some systems
ini_set(cookie_path) is ignored)

bug 322: locked category is visible to all the users/groups that have been
assigned the permissions

git-svn-id: http://piwigo.org/svn/trunk@1117 68402e56-0260-453c-a942-63ccdbb3a9ee

include/common.inc.php

@@ -234,6 +234,7 @@ include(
 
 if (is_adviser())
 {
+  ob_start();// buffer output so that cookies work
   echo '
   <div class="titrePage">
     <h2>