Standalone edc's don't need a par file.  We use par files to get dcuid's and model rates.  This update expands local_dc to allow specifying a dcuid & rate on the command line.

Added some unit testing code to local_dc
Updated the standalone edc test to use inline dcuid notation
Converted local_dc to use the arg library

refactored getmodulerate() into /util/modelrate.c.  Affects local_dc, mx_stream, pub_sub_stream.  I was unable to build mx_stream due to missing openmx.  local_dc builds but is not tested.  pub_sub_stream builds and pasts ctest, but it also passed when getmodelrate() was an empty function.

Local_dc reads RT model data from mbuf (rmIpcStr) concentrates the data
into one block and stores it in an output mbuf (daq_multi_cycle_data_t).

In a standalone system this would be the data concentrator.  On a larger
system, this prepares data for a streamer process.

This also adds a basic test for local_dc which starts several local
simulated FE streams, concentrates their data and checks that each
channel is available in the output with the expected values.

This removes fe_data_concentrator.
This updates code in fe_stream_test.
This adds a new fe_stream_check, renaming the old (and disabled) one
to fe_stream_check_nds.

This also enables cmake based testing.

!!Warning the tests fail unless mbuf and gpstime are enabled!!

ix_fb_rcv -> ix_recv
zmq_rcv_ix_xmit_delay -> zmq_recv
mx2ix -> omx_recv
ix_xmit - added as placeholder
local_dc - added as placeholder
mx_fe -> omx_xmit
zmq_fe -> zmq_xmit

No longer builder mx_stream.