libstfinv [WP]: make filter response tapering part of processing

src/libs/libstfinv/stfinvfourier.cc

@@ -302,7 +302,7 @@ namespace stfinv {
    */
   void STFFourierDomainEngine::fftoutput()
   {
-    // NOTE: apply taper here
+    if (this->Mapplystftaper) { this->taperstf(); }
     this->convolve();
     if (Mapplyshift) { this->stfshift(); }
     Mfftengineoutput.c2r();