visualize_metrics: Function to produce FMT metric visualizations
In econtijoch/FEAT: FMT Efficacy Analysis Toolkit

Function to produce FMT metric visualizations

1 2	visualize_metrics(N_donor, N_recipient, N_postFMT, N_P_Don, N_P_Rec, N_unique_postfmt, N_shared_postfmt, title_text)

`N_donor`	number of otus in donor
`N_recipient`	number of otus in recipient
`N_postFMT`	number of otus in post-fmt
`N_unique_postfmt`	number of post-fmt otus that are unique to post-fmt condition
`N_shared_postfmt`	number of post-fmt otus that are shared between donor and recipient
`title_text`	Text to generate title
`N_P_Donoror`	number of post-fmt otus from donor
`N_P_Recipientipient`	number of post-fmt otus from recipient