Log Message:
Updated p5-Date-Manip to 6.55.

6.55

       Fixed bug where $::TZ wasn't used
           The $::TZ variable was not getting interpreted correctly when
           searching for a timezone.  RT 114949.

       Fixed bug where recurrences were not parsed correctly
           Passing in incorrect values for a field was not trapped in all
           cases and it led to problems.  All values passed in to a recurrence
           are now correctly checked.  Albert Hilazo

       Fixed a bug in some methods of creating new objects
           Some methods of creating new objects based on existing objects did
           not correctly use the existing object.  Bug has never been
           reported, but was discovered when adding tests to get 100%
           coverage.

       Time zone fixes
           Newest zoneinfo data (tzdata 2016f)

       Test fixes
           Added a number of new tests based on Devel::Cover.