add default attribute and change getMapBack to be a little more readable wrt missing and default values
rework how setTrackScale reads track data to make compatible with default attribute
fix bugs in last commit
typos
update tracks with 0 default values for bigwigs
add updated results
update readme
add graphs for latest results
cast missingVal
fix category map to properly apply scaling to default values
change log 0 checks in scale.  now to be avoided with shift or assertion error
change view to print out emissions only if they greater than 0.00005
update results after fixing view
update figures