added license info

mkgraph.pl

@@ -1,5 +1,23 @@
 #!/usr/bin/perl
 
+# statgraph: A simple host resource graphing tool
+# Copyright (C) 2004-2011  Ben Charlton <ben@spod.cx>
+#
+# 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; see the file COPYING. If not, write to the Free 
+# Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 
+# MA 02110-1301 USA, or see http://www.gnu.org
+
 use strict;
 use StatGraph;
 use File::Copy;