[Ifeffit] The difference of EXAFS oscillation when using Athena and when using Larch

[Matt Newville]

Hi Yuji,

The attached larch script (a modification of your script but note: not
python, so you may have to add a bunch of '_larch=mylarch' arguments) to
show the effects of smoothing with Savitzky-Golay and of interpolating onto
a "classic XAFS energy grid".   You might want to play around with this
different options.  It definitely seems that none of these methods are
systematically over-smoothing the data and reducing the amplitudes of the
oscillations -- one more reason to use Larch instead of Ifeffit.  But it
also seems like smoothing this data with a Savitzky-Golay fitler is helpful.

Also attached are plots showing k- and R-space generated from the attached
script.

--Matt
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