Added uniform copyright notice to all files of the server core.

server/screenlist.c

@@ -1,3 +1,18 @@
+/*
+ * screenlist.c
+ * This file is part of LCDd, the lcdproc server.
+ *
+ * This file is released under the GNU General Public License. Refer to the
+ * COPYING file distributed with this package.
+ *
+ * Copyright (c) 1999, William Ferrell, Scott Scriven
+ *		 2001, Joris Robijn
+ *
+ *
+ * All actions that can be performed on the list of screens
+ *
+ */
+
 #include <stdlib.h>
 #include <stdio.h>