moving section on markers earlier so that "elite" markers are introduced for later sections
revisions made prior to initial submission
Merge branch 'devel' of https://github.com/gjospin/PhyloSift into devel
Merge branch 'devel' of https://github.com/gjospin/PhyloSift into devel
typo fix
adding some code to do procrustes analysis of PCA
calculate correlations of phylo diversity and host age
improving error message for issue #423