modified struct for convenience

include/libhqr.h

@@ -95,9 +95,9 @@ typedef struct libhqr_tiledesc_s{
 
 typedef struct libhqr_tileinfo_s{
     int type;
-    int currpiv;
-    int nextpiv;
-    int prevpiv;
+    int *currpiv;
+    int *nextpiv;
+    int *prevpiv;
     int first_nextpiv;
     int first_prevpiv;
 } libhqr_tileinfo_t;