Breaks an array of TT2000 epoch values down into two dimensional array,
the first dimension being the count of the epoch values, and the second
dimension being their full, UTC-based date/time component parts for
each value.
This method returns the status code reflecting whether the leap
seconds are from a external file, defined by an environment variable,
or the leap seconds are based on the hard-coded table in the class.
Sets the file backward flag so that when a new CDF file is created,
it will be created in either in the older V2.7 version or the current
library version, i.e., V3.*.