Fix crash on hyperthreaded SLURM clusters (#250)

libmuscle/python/libmuscle/manager/qcgpj_instantiator.py

@@ -209,7 +209,7 @@ def _send_resources(self) -> None:
         """Converts and sends QCG available resources."""
         resources = Resources()
         for node in self._qcg_resources.nodes:
-            resources.cores[node.name] = set(map(int, node.free_ids))
+            resources.cores[node.name] = {int(n.split(',')[0]) for n in node.free_ids}
 
         self._resources_out.put(resources)