Print help for --ganga-version when using -h or --help

LbConfiguration/scripts/ganga

@@ -10,6 +10,11 @@ while [ $# -ne 0 ] ; do
           GANGA_VERSION=$1
           shift
           ;;
+        --help|-h)
+          echo "Use \"$0 --ganga-version X.Y.Z [args]\" to use a specific version of ganga"
+          echo
+          break
+          ;;
         *) break ;;
     esac
 done