switch to Ord1 argument to split plot
no subplot when Fact1 unique length is equal to nsamples(data)

add an argument to bars_fun to split graph as facet_wrap

a new argument in `bars_fun()` named `split` to separate compositional barplot like `facet_wrap`

See merge request !1

allow to plot up to 7 groups
+ venn table core and exclusive counts

bars: fix output
dada2_fun: small changes on torrent sop
beta_light: add first covariable as shape argument in ordination