mean power (rather than 1-norm) and linear interpolation #54
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This fixes #48, where the mean frequencies got pretty weird for the orthogonal wavelets sometimes. Turns out, power mean freq is more accurate, so switching to that.
I also noticed some ringing when using Quadratic or higher interpolation; given that I'm already upsampling beyond the needed level, and using interpolation to align the points exactly, linear should do just fine (and won't ring).
Also fixes #52 and #53