- Removed SCStart/EndBuffering as far as possible and fixed an issue with

the capture command in that it not put resluts into the Tcl interpreter.
  This broke scriptcontext scripts in complicated situations.
- Resolved some issues with the TAS calculation and negative scattering sense.
- Fixed a bug which did not reset the state to idle after checking
  reachability in confvirtualmot.c


SKIPPED:
	psi/autowin.c
	psi/eigera2.c
	psi/jvlprot.c
	psi/makefile_linux
	psi/sinqhttpopt.c
	psi/tasscan.c

scan.c

@@ -507,7 +507,8 @@ CountEntry CollectCounterData(pScanData self)
 /*---------------------------------------------------------------------------*/
 static int ScanLoop(pScanData self)
 {
-  int i, iInt, iRet, iStatus;
+  int i, iInt, iRet, iStatus, iHeaderWritten = 0;
+  
 
   assert(self);
   assert(self->pCon);
@@ -548,6 +549,18 @@ static int ScanLoop(pScanData self)
       continue;
     }
 
+    if(iHeaderWritten  == 0) {
+      iRet = self->WriteHeader(self);
+      iHeaderWritten++;
+      if (!iRet) {
+	SCWrite(self->pCon, "ERROR: cannot open data file, Scan aborted",
+		eError);
+	self->pCon = NULL;
+	self->pSics = NULL;
+	return 0;
+      }
+    }
+
 /*-------------- count */
     iRet = self->ScanCount(self, i);
     /* finished, check for interrupts. Whatever happened, user 
@@ -648,15 +661,6 @@ int DoScan(pScanData self, int iNP, int iMode, float fPreset,
   }
 
 
-  iRet = self->WriteHeader(self);
-  if (!iRet) {
-    SCWrite(self->pCon, "ERROR: cannot open data file, Scan aborted",
-            eError);
-    self->pCon = NULL;
-    self->pSics = NULL;
-    return 0;
-  }
-
   self->iActive = 1;
   iRet = ScanLoop(self);
   ScriptScanFinish(self);