fix calculation bugs in encode_subframe_(): max_qlp_coeff_precision when qlp_coeff_prec_search; account for qlp coeff overhead in guessing the best lpc order; default to hann instead of rectangular window on assertion failure
fix calculation bugs in encode_subframe_(): max_qlp_coeff_precision when qlp_coeff_prec_search; account for qlp coeff overhead in guessing the best lpc order; default to hann instead of rectangular window on assertion failure

toofishes/flac,toofishes/flac,toofishes/flac,toofishes/flac