Parallelize MakeComparisonFiles
Add option for stripping out a low rate of mapping

In my experience, this also tends to correlate well with shitty data for that
slice. Probably better to ignore it, or re-calculate the average based on
neighbors.
Use diagonal instead of crosshatching to indicate NaN

I found the crosshatching a little distracting, it doesn't work well with
varying slice widths since you sometimes don't see the full hatch, and it also
had trouble lining up in a consistent manner.
Add an 'absolute' earth-mover distance function

This should take into account changes in absolute levels.  In practice, it
seems to weight far too heavily on the changes in level, and too little on the
patterns
Refactoring, various plotting tweaks
Start on code to make comparison betweeen binding and fold-change in bcd genes

See daily notes for 5 september, 2014
Use box height for row labels, rather than box_size