Added notes about epochs, the year 2038, and a small Y2K disclaimer (all with index entries!).  Also update the list of functions that take or yield a time represented as a 9-tuple.
Added notes about epochs, the year 2038, and a small Y2K disclaimer
(all with index entries!).  Also update the list of functions that
take or yield a time represented as a 9-tuple.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator