Enhancement in dirvar score again

Add a correction to ensure that fractdim score is in [0..1]. The new
score in given by 1 - (1/((x+1)**4)) with x the old factdim score (between
[0..2] or [0..4] ).

gte/__main__.py

@@ -274,8 +274,9 @@ else:
     stop = time.time()
 
     score_dir = sum([t.dirvar() for t in turmits]) / len(turmits)
-    msg = 'DirVar %.3f Fractdim %.3f after %d steps in %.2fs (%dus per step)'
-    msg %= (score_dir, w.fractdim(), args.steps,
+    fractdim = w.fractdim()
+    msg = 'Score %.3f DirVar %.3f Fractdim %.3f after %d steps in %.2fs (%dus per step)'
+    msg %= (score_dir * fractdim, score_dir, fractdim, args.steps,
             stop - start,
             ((stop - start)*1000000)//args.steps//args.turmit_count)
     logger.info(msg)

gte/world.py

@@ -241,9 +241,13 @@ class LivingTurmit(Turmit):
     def dirvar(self):
         ''' @brief Process @ref _dirvar to return a direction variation
             score
-            @return a score in [0..2]
+            @return a score in [0..1]
         '''
-        return self._dirvar / (self._steps * 2)
+        dvres = 1 + (self._dirvar / (self._steps * 2))
+        return 1 - (1/(dvres**4))
+
+        #return self._dirvar / (self._steps * 2)
+
         #d = self._dirvar
         #return sum([sum([abs(d[i][j] - d[i+1][j]) for j in (0,1)])
         #                 for i in range(len(d)-1)]) / (self._steps * 2)