Add setting to send old data, one cycle for scalars and one elemenbt for arrays (edwin needed for simpler triggering of incremental card timestamp).

src/ecmcDAQDataArray.h

@@ -28,7 +28,7 @@ class ecmcDAQDataArray : public asynPortDriver {
   void        connectToDataSources();
   void        execute();
   void        addChannel(int type);
-  void        addDataItemToChannel(const char* name, int format); // Always add to last added channel
+  void        addDataItemToChannel(const char* name, int format, int oldData); // Always add to last added channel
   void        setEnable(int enable);
   size_t      getArraySize();
   int         validate();