Add a handful of new formats. [rt #43468 - Clayton L. Scott]
Don't eventually try to guess the century.
Introduce and use a class for common test routines.
Test compile-time loading of Test.pm.
Rename the misnamed 'hour' metadata option to 'hours'.
_daytime() does not use the 'hours' metadata option when
it is set and hence remove such existing entries.For base methods which use the 'hours' metadata option,
assume a zero when no value is provided.