congruifiedCalibrations object.Function summarize_congruifiedCalibrations returns a table of
summary statistics for each node in congruified_calibrations argument.
summarize_congruifiedCalibrations(congruified_calibrations, age_column)A data.frame of summarized ages.
A congruifiedCalibrations object, output of congruify_and_mrca_multiPhylo().
A character string indicating the name of the column to be summarized.