add AGPL licence to the file

SVN:b1162[5591]

js/linkswidget.js

@@ -1,3 +1,20 @@
+// Copyright (C) 2010-2018 Combodo SARL
+//
+//   This file is part of iTop.
+//
+//   iTop is free software; you can redistribute it and/or modify
+//   it under the terms of the GNU Affero General Public License as published by
+//   the Free Software Foundation, either version 3 of the License, or
+//   (at your option) any later version.
+//
+//   iTop is distributed in the hope that it will be useful,
+//   but WITHOUT ANY WARRANTY; without even the implied warranty of
+//   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//   GNU Affero General Public License for more details.
+//
+//   You should have received a copy of the GNU Affero General Public License
+//   along with iTop. If not, see <http://www.gnu.org/licenses/>
+
 // JavaScript Document
 function LinksWidget(id, sClass, sAttCode, iInputId, sSuffix, bDuplicates, oWizHelper, sExtKeyToRemote)
 {