Updating time/p5-DateTime-Format-Natural from 0.79 to 0.83

Upstream changes:
0.83 Wed Jan 13 15:51:11 CET 2010
- Merged development version to stable.

0.82_02 Wed Jan  6 10:57:43 CET 2010
- New supported format: M/D. [rt #53187 - Shawn M. Moore]
- Handle the new format with prefer-future semantics.
- Add tests for the new format and also for related durations.
- Document the new format and variations of it.
- Restrict counting of format separators to the formatted substring.
- Move the code processing formatted dates to a separate class.
- Fix the checking for an invalid format parameter.
- Complete <date> <time> to <time> type of durations.
- Split the duration string at word boundary of the separator.
- Restore the datetime object for each parse when running tests.
- Test compile-time loading of Formatted.pm.

0.82_01 Thu Dec 31 12:10:30 CET 2009
- Save the trace of each parse while processing a duration.
- Call for formatted dates the wrapper _set() instead of set()
  in order to alter the modified counters.
- dateparse: when printing traces, print a trace for each object
  returned.
- Add tests for the trace method and improve its documentation.
- Document possible bugs and caveats.
- Rename some variables with method name strings to be more
  descriptive and also interpolate their strings initially.
- Substitute an expression for a block as used by 'map'.

0.82 Mon Dec 21 10:15:52 CET 2009
- Merged development version to stable.

0.81_04 Wed Dec 16 13:32:35 CET 2009
- dateparse: use the same class instance for each parse run;
  match case-insensitively for commands that quit.

0.81_03 Fri Dec 11 10:32:08 CET 2009
- Use string interpolation instead of concatenation for symbolic
  references in __new().

0.81_02 Wed Dec  9 20:07:19 CET 2009
- Reduce the common logic of _valid_date() and _valid_time()
  by moving most of it to a method.
- Store the daytime option internally with a less nested name.

0.81_01 Mon Dec  7 11:14:19 CET 2009
- Place the common body of _add() and _subtract() in a single method.
- Comment the inverse use of _add() within _add_or_subtract().
- Set values at once within _check_time().
- Initialize tokens with an anonymous array reference.
- Purge last unneeded occurrence of 'scalar'.

0.81 Sat Nov 21 12:59:17 CET 2009
- Merged development version to stable.

0.80_02 Wed Nov 18 10:53:05 CET 2009
- Move utility and wrapper methods to separate classes.
- Test compile-time loading of Utils.pm and Wrappers.pm.
- Don't force explicit scalar context where an implicit one exists.

0.80_01 Mon Nov  2 10:59:46 CET 2009
- Invoke _valid_date() in _day_month_year() to assert the
  validity of the date before setting it.
- Separate fixed time data for testing purpose from code.

0.80 Fri Oct 30 10:15:53 CET 2009
- Merged development version to stable.

0.79_02 Mon Oct 26 10:11:09 CET 2009
- Improve wording and formatting of the documentation.
- Update broken license links.

(sno)