Log Message:
Update to 1.15
Update HOMEPAGE
Change p5-Test-Number-Delta to TEST_DEPENDS

Upstream changes:
1.15 2021-01-23

 - Provide set_angle_unit() as an alternative to the too generically
   named method set_units(). The name set_angle_unit() corresponds
   nicely to the existing method set_distance_unit().

 - Add accessors get_angle_unit(), get_distance_unit(), get_ellipsoid(),
   get_equatorial_radius(), get_polar_radius(), get_flattening(), and
   get_eccentricity(), get_longitude_symmetric(), and
   get_bearing_symmetric(). These are necessary for subclassing.

 - Correct the version numbering in Changes (this file) and add missing entry
   for version 1.11. Format CHANGES according to CPAN::Changes::Spec.

 - Rename the too generically property "units" to \ 
"angle_unit", and
   "distance_units" to "distance_unit".

 - Rename the following internal object properties:

      "latitude"  -> "latitude_symmetric"   (only used \ 
internally)
      "longitude" -> "longitude_symmetric"
      "bearing"   -> "bearing_symmetric"

   This makes them more descriptive, and they now match the methods
   set_latitude_symmetric() and set_bearing_symmetric(). The old object
   property names without the "_symmtric" suffix are still supported.

 - Improve documentation and fix typos in the POD. Add more information to the
   SYNOPSIS. Update BUGS and SUPPORT sections. Update AUTHOR and COPYRIGHT
   information.