streamthinca / lloidhandler: detangle trigger class import

- there was a time when streamthinca needed to define a special class to be
  used for triggers to allow the coincidence algorithm to work, and so it
  made sense for the definition to live in streamthinca where the
  requirements were defined.  today no special class is required, the
  underlying trigger class is simply used as-is, but code like lloidhandler
  is still importing the symbol from streamthinca instead of importing it
  themselves directly.  this patch untangles this now gratuituous
  interdependency.

gstlal-inspiral/python/lloidhandler.py

@@ -85,6 +85,7 @@ from gstlal import inspiral
 from gstlal import pipeio
 from gstlal import simplehandler
 from gstlal import streamthinca
+from gstlal.snglinspiraltable import GSTLALSnglInspiral as SnglInspiral
 import lal
 from lal import LIGOTimeGPS
 from lal import rate
@@ -970,7 +971,7 @@ class Handler(simplehandler.Handler):
 				# FIXME why does mapinfo.data come out as
 				# an empty list on some occasions???
 				if mapinfo.data:
-					events.extend(streamthinca.SnglInspiral.from_buffer(mapinfo.data))
+					events.extend(SnglInspiral.from_buffer(mapinfo.data))
 				memory.unmap(mapinfo)
 
 			# FIXME:  ugly way to get the instrument

gstlal-inspiral/python/streamthinca.py

@@ -46,7 +46,6 @@ import time
 
 from ligo.lw import ligolw
 from ligo.lw import lsctables
-from gstlal.snglinspiraltable import GSTLALSnglInspiral as SnglInspiral
 import lal
 from lalburst import snglcoinc
 from lalinspiral import thinca