The S4 class for storing taxa-abundance information.
Because orientation of these tables can vary by method, the orientation is
defined explicitly in the taxa_are_rows slot (a logical).
The otu_table class inherits the matrix class to store
abundance values.
Various standard subset and assignment nomenclature has been extended to apply
to the otu_table class, including square-bracket, t, etc.
A single logical specifying the orientation of the abundance table.
This slot is inherited from the matrix class.
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