remove gsl matrix for snr time series, just use an array

gstlal-ugly/gst/lal/gstlal_itac.h

@@ -80,7 +80,7 @@ typedef struct {
 	char * channel_name;
 	gboolean last_gap;
 	gboolean EOS;
-	gsl_matrix_complex *snr_mat;
+	double complex *snr_mat;
 	gsl_matrix_complex *autocorrelation_matrix;
 	gsl_vector *autocorrelation_norm;