- 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.

choco.w

@@ -92,7 +92,7 @@ the error can be ignored or was fully resolved.
 \item[pParList] is text string containing a comma separated list of
 all parameters understood by this driver. 
 \item[pPrivate] Is a pointer to a driver specific specific data
-structure. This data structure will not be messed with by upper level code.
+structure. This data structure shall not be messed with by upper level code.
 \end{description}
 
 \subsubsection{The Controller Object}
@@ -200,6 +200,7 @@ controller driver:
    typedef struct __CHEV {
                           char *pParName;
                           pCodri pDriv;
+                          int iLastError;
                          }CHev, *pCHev;
 @}