Spectrum index lookup table bug fix. #14
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As kindly pointed out in #13, the code responsible for generating the spectrum index -> (file, file_index) lookup table behaves incorrectly if more than one file is used in a
SpectrumDataset, since the original code would only index spectra up to the number of spectra in the last file in the dataset, because of the incorrect usage ofoffsetsoverself._file_offsets.There was an additional off by one error caused by adding two 0's to the beginning of the offset array instead of just one.