Supposed fix for license issues

I have no clue what to put here so I'll just use what the About dialog
provides (unless specified otherwise in the file)

src/fe-gtk/chanview.c

@@ -1,3 +1,22 @@
+/* HexChat
+ * Copyright (C) 1998-2010 Peter Zelezny.
+ * Copyright (C) 2009-2013 Berke Viktor.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
 /* abstract channel view: tabs or tree or anything you like */
 
 #include <stdlib.h>