ab-bench-scale: also executed barriers, red and 2PC + use Sim leaf nodes
ab-bench-scale: also executed barriers, red and 2PC + use Sim leaf nodes

Before, we were only executing ab.
We use now only the Simulator given leaf nodes, which are at most 10
nodes and the nodes receiving the message last according to the
prediction.

libsmelt/libsmelt,libsmelt/libsmelt,libsmelt/libsmelt,libsmelt/libsmelt