+ GRAS:
+ * If you use GRAS, you should stay at SimGrid 3.7 or something since
+ it was not really maintained with the latest versions of SimGrid as
+ nobody stepped in to take the maintainership over.
+ * Keeping it was thus a trap to our potential users, that could take
+ it instead of MSG or SMPI by mistake. GRAS also induces a lot of XBT
+ code (for portability sake), that must be maintained too.
+ * For all these reasons, we killed GRAS. If someone wants to revive it
+ in the future, don't cry, our git history still remembers of GRAS.
+
+ SMPI:
+ * Now works on Windows too!
+ * Much more extensive test suite, from MPICH
+
+ MSG:
+ * New function: MSG_process_get_number()