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this allows the shared memory regions to be created in /dev/shm/ e.g.
instead of the work dir.

Can now select between sockets (default) or rdma.

Includes an new DistributedExperiment class, a runner for distributed
experiments, a basic sequential runtime, and an example experiment
"dist_netperf" (although scaling beyond 2 hosts is currently still
broken in the rdma proxy).

This simplifies both ends, especially with checkpoints.