Renamed class OneDPowerSpectrum to PowerSpectrum. Combined its methods _generate_frequency_indices and _create_indices. Shifted fft calculation into its own function for cleaner inheritance. Commented everything, as a result found and corrected bug where default window parameters were not being overridden in PowerSpectrum.
Renamed class OneDPowerSpectrum to PowerSpectrum. Combined its methods _generate_frequency_indices and _create_indices. Shifted fft calculation into its own function for cleaner inheritance. Commented everything, as a result found and corrected bug where default window parameters were not being overridden in PowerSpectrum.

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