- 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.tex

@@ -270,6 +270,7 @@ $\langle$evada {\footnotesize ?}$\rangle\equiv$
 \mbox{}\verb@   typedef struct __CHEV {@\\
 \mbox{}\verb@                          char *pParName;@\\
 \mbox{}\verb@                          pCodri pDriv;@\\
+\mbox{}\verb@                          int iLastError;@\\
 \mbox{}\verb@                         }CHev, *pCHev;@\\
 \mbox{}\verb@@$\diamond$
 \end{list}