compare different processing methods

[antgonza]

For example:
compare study 1 picked against gg_13_8_otus vs. study 2 against gg_otus_4feb2011

[antgonza]

Things to consider if we only focus on procrustes:

• GUI that allows you to select 2+ PCoA files and select centroid
• Code to validate sample names so they match
• Change plugins to accept multiple args of the same kind: multiple PCoAs

[antgonza]

Closing this one as we have settle to combine different data types processed with the same parameters.