+S4U:
+- Actor: Merge signals on_migration_start/end into on_host_change
+- Actor: Rename migrate() into set_host()
+- Disk: Allow users to get the read and write nominal bandwidth values
+- Exec: Implement wait_for(timeout)
+- Io: Implement wait_for(timeout)
+
+XML:
+- Parse errors now raise a simgrid::ParseError that you may want to catch.
+