Rework some of the data in the taxmap object.

[grabear]

Per my discussion today with @xiaoumc, I realize that we need to really be able to see the difference in relative and absolute changes per taxa. One way we can do this is to look at the fold change.

-	Total Abundance	Firmicutes Abundance	Relative Firmicutes Abundance
Control	1000	10	10/1000 = 0.01
Stress	2000	100	100/2000 = 0.05

-	Total	Absolute	Relative
Fold Change (Astress/Acontrol)	0.5	10	20

We can add this to the statistical analysis for abolute and proportionate taxa tables at some point.