can wait on several of them simultaneously (as in waitany).
* Fix the way to handle tokens in semaphores so that all access patterns
work: {acquire, acquire_timeout, waitany} / {release, release_forever}.
+ * kill the dirty pimple SIMIX_message_sizes_output()
+ Please use (proper) visualization instead
SIMDAG
* Fix a bug in the management of tasks of size 0 in the surf network