Evol : Fixing comments in users_controler.php, users.php, usergroups_controler.php

Fix : adding security table in core_tables.php
Evol : Replacing $_SESSION['tablename']['security'] by SECURITY_TABLE in SecurityControler.php
Evol : Replacing $_SESSION['tablename']['usergroups_services'] by USERGROUPS_SERVICES_TABLE_TABLE in ServiceControler.php
Fix : Xtml 1.0 strict : html attribute onLoad becomes onload
Fix : Xtml 1.0 strict : html attribute onClick becomes onclick
Fix : Xtml 1.0 strict : html attribute onChange becomes onchange
Fix : deleting language="javascript" in script tag and replacing with type="text/javascript"