Changed namespace to "Utilities"

cluster.cc

@@ -16,7 +16,7 @@
 
 using namespace NEWIMAGE;
 using std::vector;
-using namespace Options;
+using namespace Utilities;
 
 string title="cluster (Version 1.0)\nCopyright(c) 2000, University of Oxford (Mark Jenkinson)";
 string examples="cluster --in <filename> --thresh <value> [options]";