Fix PSD prior error

This hopefully fixes the How did PSD come outside the prior error. It was caused by incorrect calculation of the PSD prior at the beginning of the run. This has been fixed now. Will look into whether this change makes the error go away too.

src/BayesLine.c

@@ -2752,6 +2752,7 @@ void BayesLineBurnin(struct BayesLineParams *bayesline, double *timeData, double
   double *Sl    = malloc(sizeof(double)*(N+1));
   
   int imin = data->fmin*Tobs;
+
   
   for(i=0; i<N/2; i++)
   {
@@ -2759,10 +2760,12 @@ void BayesLineBurnin(struct BayesLineParams *bayesline, double *timeData, double
     logSn[i] = 1.0;
     Sl[i]    = 0.0;
     
+    if(i<N/2-imin){
     bayesline->Sbase[i] = 1.0;
     bayesline->Sline[i] = 0.0;
+    }
   }
-  
+
   //interpolate cubic spline points
   CubicSplineGSL(spline->n,spline->points,spline->data,N/2-imin,f+imin,logSn+imin);
 
@@ -2801,7 +2804,7 @@ void BayesLineBurnin(struct BayesLineParams *bayesline, double *timeData, double
     bayesline->priors->lower[i] = bayesline->Sbase[i]/100.;
     bayesline->priors->upper[i] = bayesline->Snf[i]*100.;
   }
-  
+
   free(f);
   free(logSn);
   free(Sl);