- A few fixes to the hsitogram memory codes

- Many fixes for the triple axis code

tas.w

@@ -49,6 +49,7 @@ typedef struct {
         int iFileNO;
         int iFast;
         char scanVar[80];
+	float oldSRO;
    }TASdata, *pTASdata;
 @}
 \begin{description}
@@ -70,6 +71,10 @@ variables. This can be 0 for simple variables or 1 for a motor.
 no wait for the motors  to finish driving.
 \item[scanVar] memorizes the first scan variable with a step of greater
  zero.
+\item[oldSRO] keeps the old value of the motor SRO. This because the
+helmholtz angle  stored in the variable helm has to be corrected when
+SRO has been driven. This value is initialised in tasdrive and
+TasScanDrive. The actual correction is done in TASUpdate.
 \end{description}
 The constants for the parameters are defined in the header file. 
 
@@ -237,8 +242,10 @@ These are mainly the interpreter interface functions:
 
 #define MAXPAR 130
 #define MAXADD 20
-#define MAXEVAR 10
- 
+#define MAXEVAR 12
+
+#define SROMOT 7  /* number of the SRO motor */ 
+#define A4MOT  3  /* index of a4 motor */
 /* --------------------- data structure -------------------------------*/
 @<tasdata@>