Added functionality to build models with two compositions (baseline and follow-up)#2

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jhmigueles wants to merge 2 commits intotystan:masterfrom jhmigueles:master

+113-47

Commits on Jan 30, 2023

added function to consider a follow-up composition for prospective or change analyses
jhmigueles
committed

Commits on Jan 31, 2023

added functionality to predict_delta_comps to build models with 2 compositions (baseline and follow-up)
jhmigueles
committed