add GPL boilerplate to CurrentCost.pl, justified by the blurb on http://www.jibble...

diff --git a/CurrentCost.pl b/CurrentCost.pl
index 430ba05..74ee1ea 100755 (executable)
--- a/CurrentCost.pl
+++ b/CurrentCost.pl
@@ -2,6 +2,20 @@
 # Current Cost monitoring/rrd initialisation script
 # Copyright (C) 2010 W R Younger.
 #
+#    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 3 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, see <http://www.gnu.org/licenses/>.
+#
+#
 # This script may be considered to be a derivative of earlier work 
 # by Paul Mutton (http://www.jibble.org/currentcost/). I have 
 # merged the initialisation into the script and added serial port