values were ignored in some cases. The timings of these functions can now
be significantly different.
+ * smpi/cpu-threshold:-1 should become smpi/simulate-computation:no
+ smpi/running-power is renamed to smpi/host-speed
+
Dropped functions and features
* msg_mailbox_t and associated functions. Use s4u::Mailbox instead.
- MSG_mailbox_is_empty() -> Mailbox::empty()