CZT (v0.0.6)

• czt:
  • freq2time and time2freq:
    • Fix phase correction.
    • Remove scaling factor (hack).
    • Remove t_orig and f_orig arguments. Not needed anymore.
    • Don't return original frequency/time in time2freq and freq2time. Instead make a copy of the Numpy array.
  • Always default to FFT settings if output frequency/time array is not specified.
  • Fix M!=N error in czt.czt. Use proper k-range.
  • Optimize pd and skew_circulant_multiply. pd is now a similar speed as scipy.
• Profiling:
  • Add benchmarking scripts using perfplot.
  • Add simple timing scripts.