An implementation that combines trait data and a phylogenetic tree (or trees) into a
single object of class 'treedata.table'. The resulting object can be easily
manipulated to simultaneously change the trait- and tree-level sampling.
Currently implemented functions allow users to use a 'data.table' syntax when
performing operations on the trait dataset within the 'treedata.table' object.
For more details see Roman-Palacios et al. (2021)