[MP3 ENCODER] tot_noise

[Istvan Varga]

tot_noise is currently calculated by adding noise values in dB.
I think it would be better to sum the energy of noise, i.e.
changing
    tot_noise += noise;
to
    tot_noise += pow (10.0, noise/10.0);
This makes -X2 and -X3 much more stable.
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