This function uses treeClust to build a distance. It is intended to act analagously
to daisy and dist.
treeClust.dist(x, ...)Data set from which to compute distances via treeClust.
Other argments to be passed to treeClust.
An object of class dissimilarity.
The treeClust function's first argument is named dfx. This calls the same code, but by naming
the first argument x it allows users to employ this function interchangeably with dist
and daisy, which expect arguments named x. This function also sets the return.dists
flag and extract the distance object so that that is the only thing returned.