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src/spectral/filterbank*.c: reduce filterbank size to n/2+1, other half is always empty

--- a/src/spectral/filterbank.c

+++ b/src/spectral/filterbank.c

@@ -44,7 +44,7 @@

   fb->n_filters = n_filters;

   /* allocate filter tables, an fvec of length win_s and of filter_cnt channel */

-  fb->filters = new_fvec (win_s, n_filters);

+  fb->filters = new_fvec (win_s / 2 + 1, n_filters);

   return fb;

 }

--- a/src/spectral/filterbank_mel.c

+++ b/src/spectral/filterbank_mel.c

@@ -69,7 +69,7 @@

   /* fill fft_freqs lookup table, which assigns the frequency in hz to each bin */

   for (bin = 0; bin < win_s; bin++) {

-    fft_freqs->data[0][bin] = aubio_bintofreq (bin, samplerate, win_s);

+    fft_freqs->data[0][bin] = aubio_bintofreq (bin, samplerate, (win_s - 1) * 2);

   }

   /* zeroing of all filters */