Implement Attrition Report for feasibility study results

[chrisknoll]

We currently show an 'intersection report' for the feasibility study results.

Another view of the study results would be an 'attrition report' such that starting at 100%, applying each inclusion rule to the index population will trim the matching population for each inclusion rule. The tabular data would show how the population starts at 100% and each inclusion rule reduces the population. The visualization would be a stack of bars that starts at 100% width and each subsequent bar would be reduced by the amount that the inclusion rule lost of the prior population group.