psadd: Additions to phyloseq package for microbiome analysis

Taxa/OTU abundance in a given sample coupled with rank and taxonomic information

1	get_taxa_nomy(physeq, smp, level = "Species")

`physeq`	`phyloseq-class`
`smp`	A single sample of interest. This integer or sample name will be passed to `get_taxa`.
`level`	A character indicating the taxonomic rank of interest. Should be in `rank_names`. Default is "Species".

An abundance sorted data.frame with the following components

Sample: Sample of interest
Abundance: Taxa/OTU abundance in the sample of interest
Rank: Taxa/OTU rank in the dataset. The higher the rank, the less abundant the OTU.
level: Taxonomic rank of interest. Note that the column is named after the provided value from level.