- 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.

hklscan.c

@@ -17,6 +17,7 @@
 #include "scan.h"
 #include "hkl.h"
 #include "scan.i"
+#include "matrix/matrix.h"
 #include "hkl.i"
 #include "hklscan.i"
 #include "hklscan.h"