- added backwards calculation of hkl from four circle angles. This

required inclusion of a matrix package.
- modified  counter error handling to send a Stop when the _BAD_BUSY
  error is received.
- added an environment interface to the general controller stuff in choco.*
  Also added setting a parameter directly at the controller object.
- Added a driver for the ETH High Temperature Furnace to be used at
  SANS.

counter.c

@@ -233,7 +233,15 @@
       sMon.fCurrent = fControl;
       sMon.fPreset  = self->pDriv->fPreset;
       sMon.pName = self->name;
-      InvokeCallBack(self->pCall,MONITOR,&sMon);
+      if(self->iCallbackCounter > 20)
+      {
+         InvokeCallBack(self->pCall,MONITOR,&sMon);
+         self->iCallbackCounter = 0;
+      }   
+      else
+      {
+        self->iCallbackCounter++;
+      }
       self->pDriv->fLastCurrent = fControl;
       return eCt;
  }
@@ -357,6 +365,7 @@
       pRes->pCountInt->Halt = Halt;
       pRes->pCountInt->Pause = PauseCount;
       pRes->pCountInt->Continue = ContinueCount;
+      pRes->iCallbackCounter = 20;
       
       pRes->pCall = CreateCallBackInterface();