ApeTime() reads the time that a tree written with 'ape' was modified,
based on the comment in the Nexus file.
ApeTime(filepath, format = "double")
Character string specifying path to the file.
Format in which to return the time: 'double' as a sortable numeric;
any other value to return a string in the format
ApeTime() returns the time that the specified file was created by
ape, in the format specified by