These functions prints a compact summary of a phylogeny, or a list of
phylogenies, on the console.
Usage
## S3 method for class 'phylo':
print(x, printlen = 6 ,...)
## S3 method for class 'multiPhylo':
print(x, details = FALSE ,...)
## S3 method for class 'multiPhylo':
str(object, ...)