Major re-write of post_processor

New approach writes all data required to calculate stats from Li 2014
(http://arxiv.org/abs/1404.0929) and Sung 2012 for validatoin.
clean up of error reporting for post processor
new post processor compiles as of this commit
Merge branch 'better-validation'
add post-processor to Cmake build
removed sample name parser, tweaks to post-processor output