Updated zmq_xmit to work with local_dc, added a test that goes from simulated fe -> zmq_xmit -> zmq_recv.
- Rewrote zmq_xmit.c to no longer do data concentration, it now depends on local_dc.
- Removed some old test code that was not being used
- Added a new test (hooked into ctest) to run several simulated FE computers, local_dc, zmq_xmit, and zmq_recv and then read the output from the zmq_recv output buffer and verify each channel.