Added public accessors for all status library indices and some other

properties. This also enabled the removal of "friend classes".

src/sinqAxis.h

@@ -304,7 +304,12 @@ class epicsShareClass sinqAxis : public asynMotorAxis {
         return asynSuccess;
     }
 
-    friend class sinqController;
+    /**
+     * @brief Return the axis number of this axis
+     *
+     * @return int
+     */
+    int axisNo() { return axisNo_; }
 
   protected:
     // Internal variables used in the movement timeout watchdog