Log Message:
Update p5-Date-Manip to 6.52:

VERSION 6.52  (planned 2015-12-01)

Added date ranges on unmodified dates in Recur

The date range can now be specified for either the fully modified dates, or
the unmodified dates.  This will make it easier to work with holidays in some
instances.  Based on http://perlmonks.org/?node_id=1148735.

Added IWn and NWn recurrence modifiers

Based on http://perlmonks.org/?node_id=1148735.

(!) Reworked holidays slightly

Previously, every line in the Holidays section defined a unique holiday.
Now, the names determine the list of holidays.

It is not allowed to have two separate holidays named exactly the same.
It IS allowed to have complex holidays that require two (or more) lines
in the Holidays section to define them completely.

Based on http://perlmonks.org/?node_id=1148735.

Bug fixes

Fixed a bug where the RecurRange config variable wasn't getting used.

Fixed a bug where some deltas were not parsed correctly as dates.
RT 109600

Time zone fixes

Newest zoneinfo data (tzdata 2015g)

Test fixes

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