add sicsvar output to diffscan

diffscan.h

@@ -12,6 +12,7 @@
 #include "obpar.h"
 #include "scan.h"
 #include "scan.i"
+#include "sicsvar.h"
 
 typedef struct {
   pObjectDescriptor pDes;
@@ -23,6 +24,7 @@ typedef struct {
   int skipCount;
   pScanData scanObject;
   double last_report_time;
+  pSicsVariable sicsvar;
 } DiffScan, *pDiffScan;
 
 /*==================================================================*/