450089

Fixes the following issues:

-  Rename TrailGroup scope to Trace.
-  init should return a return code.
-  No sleep should be required after init (sas-client library should change to open the message queue on init - confirmed with AJH and ME that this would be better).
-  sas-client should list marker constants.
-  no messages dropped if SAS connection temporarily drops (no longer closing and purging the message queue).