+ March 29. 2021
+
+ The Ragnar Release (anniversary of the siege of Paris by Vikings in 845)
+
+ * SMPI: can now report leaks and hint about the mallocs and kernels hindering simulation scalability
+ * Doc: Several new sections in the user manual, and start documenting the internals.
+ * S4U: Direct comms from host to host, without mailboxes.
+ * Many internal cleanups and refactoring to prepare the future.