Restore networked implementation

The earlier implementation had to be updated for the VM change.
The multi-connection server needs debugging, so this version is a
single-shot server.

To run the (eval) server:
    go run src/github.com/tjim/smpcc/runtime/fatchantest/*.go x
Then, run the (gen) client:
    go run src/github.com/tjim/smpcc/runtime/fatchantest/*.go
The example is binsearch.