+XBT:
+ - Remove xbt_os_thread_specific features
+ - Remove portability wrapper to condition variables
+ - Remove xbt_os_thread_yield()
+
+SMPI:
+ - MPICH collective selector now mimics MPICH 3.3b
+ - OpenMPI collective selector now mimics OpenMPI 3.1.2 (default "tuned" setting)
+ - MPI_Init(NULL,NULL) is now allowed
+ - smpi/wtime option now injects time in gettimeofday or clock_gettime calls
+ - Command-line arguments should now be handled properly in Fortran simulations
+ - MPI Attributes and related callbacks should work in Fortran
+ - Apps using C + Fortran should now work
+ - MPI_* calls now check for non MPI_SUCCESS return values and emit warnings
+ - Support MPI_Error_String
+
+Java:
+ - Due to an internal bug, Msg.run() must now be your last line.
+ We hope to fix it in a future release, and we are sorry for the inconvenience.
+
+Fixed bugs:
+ - #22: Process autorestart seem to only work with CAS01 cpus
+ - #56: Feature request: dynamic SMPI replay
+ - #93: simgrid should not eat --help
+ - #111: How to change the loopback link characteristics?
+ - #116: Platform cluster radical
+ - #117: Platform cluster/host order
+ - #129: Replay_multiple on steroid
+ - #131: Java : autostart does not work
+ - #143: Setting a breakpoint at a given time
+ - #235: Network energy models should be integrated
+ - #264: Add ptask L07 resource tracing
+ - #271: Dynamic and manual replay of SMPI traces
+ - #279: Breakpoints option uses time deltas instead of absolute time
+ - #281: Daemonized actor no longer daemonized after an auto-restart
+ - #282: TIT convertor erase traces when using absolute path in the trace list file
+ - #285: segfault when a s4u actor kills itself with msg process tracing activated
+ - #286: Pajé traces are not exposing the number of cores
+ - #287: Command-line parsing should stop when encountering '--'
+ - #288: MPI_Init(NULL, NULL)
+ - #289: Improve documentation of Actor::on_destruction and this_actor::on_exit()
+ - #290: Method to check if a mailbox has a message ready to be consumed
+ - #291: [s4u] semaphores do not seem available yet
+ - #294: Alltoall collective implementation of mpich
+ - #295: Starting a Host as OFF is not supported
+ - #296: DTD too permissive
+ - #299: Add a s4u barrier example
+
+----------------------------------------------------------------------------
+
+SimGrid (3.20) Released June 24. 2018
+
+The proxy snake_case() release.
+
+S4U:
+ - The whole API is now using snake_case() instead of mixing it with camelCase.
+ Compatibility wrappers in place for one year.
+ - We took the opportunity to increase the consistency of the API.
+ Please report any remaining glitches.
+ - New function simgrid::s4u::Host::get_actor_count:
+ Returns the number of actors running on a specific host.