+ SimDag:
+ * Performance boost by using a swag internally to compute the set of
+ tasks that are finished and should constitute the return value of
+ SD_simulate.
+
+ XBT:
+ * Mallocators: allow value NULL for the reset function.
+ * Dicts: new function xbt_dict_new_homogeneous(void(*)(void*)) to
+ create homogeneous dictionaries, where all the elements share the
+ same free function.
+