added CCP4 class to img io export

correctly set export feature flag for dm3

modules/io/pymod/export_map_io.cc

@@ -116,6 +116,10 @@ void export_map_io()
     .def("GetEndianessOnSave", &MRC::GetEndianessOnSave)
   ;
 
+  class_<CCP4, bases<MRC> >("CCP4", init<bool,Endianess>
+           ((arg("normalize_on_save") = false,arg("endianess_on_save")=OST_LOCAL_ENDIAN)))
+  ;
+
   class_<DM3, bases<ImageFormatBase> >("DM3", init<>())
   ;
 

modules/io/src/img/map_io_dm3_handler.hh

@@ -50,7 +50,7 @@ class DLLEXPORT_OST_IO MapIODm3Handler: public MapIOHandler
     static bool MatchType(const ImageFormatBase& type);
     static bool MatchSuffix(const String& loc);
     static bool ProvidesImport() { return true; }
-    static bool ProvidesExport() { return true; }
+    static bool ProvidesExport() { return false; }
     static String GetFormatName() { return String("Dm3"); }
     static String GetFormatDescription() {return String("Format used by Gatan Inc.'s  Digital Micrograph software");}