calculate true lagged ACF now.  FFT of result is not computed yet, that's next.
now calculates FFT at offset 256... just running sanity checks right now.
Added KTTimeFrequencyDataPolar and KTWV2DData.
Implemented new histogram-making functions for KTTimeFrequencyPolar.
Added printing of KTTimeFrequencyDataPolar to KTBasicROOTWriter. Added printing of KTWV2DData to KTBasicROOTWriter.
Merge branch 'WFAnalysis' of https://github.com/project8/katydid into WFAnalysis