Attempt at doing logistic fitting of fold-change vs binding

See daily notes on 8 September
Early attempts at fitting
Speed and accuracy tweaks to map-rate skipping
Tweaks ot MakeComparisonFiles

* Option to force making a low-expression image.
* Spun out more of the svg_call parameters to separate variables.
* Tweaked sizes for printing on business cards.
Additions to TotalBindingHeatmap

* Refactoring the generation of binding matrices.
* Attempts to make fits.
* Save all fits
Multitude of changes to WTZldBcdHistograms

* Refactor earth_mover_multi so it properly deals with replicates. Not sure yet
   if I actually deal with this right in the calling code, but that's okay.

* Add in a tweakable (small) weight on how much to weight total expression
   level change

* Plotting tweaks

* Plotting refactoring

* Better handling of low expression.

* Output refactoring (now just use pandas)
Tweaks to constants and plotting order