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[filterbank] add a warning for duplicate freqs, improve nyquist warning

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

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

@@ -60,11 +60,14 @@

       return AUBIO_FAIL;

     } else if (freqs->data[fn] > samplerate / 2) {

       AUBIO_WRN("filterbank_mel: freqs should contain only "

-          "values > samplerate / 2.\n");

+          "values < samplerate / 2.\n");

     } else if (fn > 0 && freqs->data[fn] < freqs->data[fn-1]) {

       AUBIO_ERR("filterbank_mel: freqs should be a list of frequencies "

           "sorted from low to high, but freq[%d] < freq[%d-1]\n", fn, fn);

       return AUBIO_FAIL;

+    } else if (fn > 0 && freqs->data[fn] == freqs->data[fn-1]) {

+      AUBIO_WRN("filterbank_mel: set_triangle_bands received a list "

+          "with twice the frequency %f\n", freqs->data[fn]);

     }

   }