More interpolation progress

c/coreslam.h

@@ -67,6 +67,9 @@ typedef struct scan_t
     double distance_no_detection_mm;    /* default value when the laser returns 0 */
     int detection_margin;               /* first scan element to consider */
     double offset_mm;                   /* position of the laser wrt center of rotation */
+
+    /* for angle/distance interpolation */
+    void * interpolation;
      
     /* for SSE */
     float * obst_x_mm;