- 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.

matrix/DEMO.DAT

@@ -0,0 +1,20 @@
+1.1 2   3   4   5   6   7   8   9   9
+2   3.1 4   5   6   7   8   9   9   8
+3   4   5.1 6   7   8   9   9   8   7
+3   4   5   6.1 7   8   9   9   8   7
+1   2   3   4   5   7.2 7   8   9   9
+1   2   3   4   1   6   7   8.3 9   9
+6   2   3   4   5   6   7   8   9.8 9
+1   2   3   3   5   6   7   8   9   9.8
+1   2   3   4   6   6   7   8   9   9
+6   2   3   4   5   4   7   8   9   9
+3
+1
+4
+1
+2
+3
+1
+1
+2
+6