This function finds the Popular Adjacent Ligand or Self (PALs)
for each feature in the @results slot of a propd
object. Specifically, we define PALs as the adjacent node with
the highest amount of connectivity. If node itself has more
connectivity than any of its neighbors, it is its own PAL.
pals(object, k)A propr or propd object.
An integer. For propr methods, the number
of co-clusters (where all pairs receive a specified color
if and only if both members belong to same the cluster).
For propd methods, the maximum number of PALs to index
when calculating pals in the network.
A named vector of PALs, ordered by decreasing connectivity of the input nodes. The names of the result refer to the input nodes themselves.