rate_posterior: don't collect time-slide coincs

- weren't used for anything, adds baggage to the code.  in the future, it
  might be worth adding an option to select which offset vector to process,
  but none of what this patch removes would be used for that

gstlal-inspiral/bin/gstlal_inspiral_rate_posterior

@@ -164,7 +164,6 @@ def load_ranking_data(filenames, verbose = False):
 
 
 def load_search_results(filenames, ln_likelihood_ratio_threshold, tmp_path = None, verbose = False):
-	background_ln_likelihood_ratios = []
 	zerolag_ln_likelihood_ratios = []
 
 	for n, filename in enumerate(filenames, 1):
@@ -176,10 +175,17 @@ def load_search_results(filenames, ln_likelihood_ratio_threshold, tmp_path = Non
 		xmldoc = dbtables.get_xml(connection)
 		definer_id = lsctables.CoincDefTable.get_table(xmldoc).get_coinc_def_id(thinca.InspiralCoincDef.search, thinca.InspiralCoincDef.search_coinc_type, create_new = False)
 
-		for ln_likelihood_ratio, is_background in connection.cursor().execute("""
+		for ln_likelihood_ratio in connection.cursor().execute("""
 SELECT
 	coinc_event.likelihood,
-	EXISTS (
+FROM
+	coinc_event
+	JOIN coinc_inspiral ON (
+		coinc_inspiral.coinc_event_id == coinc_event.coinc_event_id
+	)
+WHERE
+	coinc_event.coinc_def_id == ?
+	AND NOT EXISTS (
 		SELECT
 			*
 		FROM
@@ -188,24 +194,14 @@ SELECT
 			time_slide.time_slide_id == coinc_event.time_slide_id
 			AND time_slide.offset != 0
 	)
-FROM
-	coinc_event
-	JOIN coinc_inspiral ON (
-		coinc_inspiral.coinc_event_id == coinc_event.coinc_event_id
-	)
-WHERE
-	coinc_event.coinc_def_id == ?
 	AND coinc_event.likelihood >= ?"""
 	, (definer_id, (ln_likelihood_ratio_threshold if ln_likelihood_ratio_threshold is not None else NegInf))):
-			if is_background:
-				background_ln_likelihood_ratios.append(ln_likelihood_ratio)
-			else:
-				zerolag_ln_likelihood_ratios.append(ln_likelihood_ratio)
+			zerolag_ln_likelihood_ratios.append(ln_likelihood_ratio)
 
 		connection.close()
 		dbtables.discard_connection_filename(filename, working_filename, verbose = verbose)
 
-	return background_ln_likelihood_ratios, zerolag_ln_likelihood_ratios
+	return zerolag_ln_likelihood_ratios
 
 
 def plot_rates(signal_rate, credible_intervals = None):
@@ -274,7 +270,7 @@ else:
 #
 
 
-background_ln_likelihood_ratios, zerolag_ln_likelihood_ratios = load_search_results(filenames, ln_likelihood_ratio_threshold = ln_likelihood_ratio_threshold, tmp_path = options.tmp_space, verbose = options.verbose)
+zerolag_ln_likelihood_ratios = load_search_results(filenames, ln_likelihood_ratio_threshold = ln_likelihood_ratio_threshold, tmp_path = options.tmp_space, verbose = options.verbose)
 
 
 #