[distance] Do not use cartesian default strategy for non-cartesian Pt/Box and Box/Box
[distance] Add preliminary version of Pt/Box spherical strategy.
[strategies] Add move course() to algorithms/detail and use it in spherical side and distance strategies.
[distance] Optimize cross_track_point_box - calculate courses only once, do not use other strategies than PP
[distance] Fix compilation error in get_comparable<> specialization for distance_cross_track_point_box<>
[convex_hull] Fix invalid number of Points generated for open OutputGeometry.
[test][convex_hull] Add tests for open output Geometries.
[convex_hull] Generate consistent results for closed and open Geometries.

The result differ only for the last Point duplicated for closed.
This code should be faster than the original since any condition isn't checked inside a copying loop and the end iterators are created only once.
[test][convex_hull] Add test for MultiPoint for which convex_hull() should return invalid Polygon.
[convex_hull] Generate "proper" number of Points also when invalid Output is generated.

E.g. for 1- or 2-Point MultiPoint input the Output is a 0-area Ring (Point-like or Segment-like respectively). After this change it should contain "proper" number of Points (3 for open, 4 for closed). The additional Point is added by duplication of the first one.
[test][convex_hull] Update convex_hull tests.

Update multi_convex_hull test to reflect recently made changes for Point-like and Segment-like Output.

Remove the test for MultiPoint from convex_hull test since it's already tested in multi_convex_hull test.
[distance][strategy] (spherical) Cosmetic changes - comment, lines length.
[disjoint] Fix A/A by replacing point_on_surface with point_on_boundary and changing relation check.
[test][disjoint] Add tests for A/A
[disjoint] Replace has_within with not_disjoint and set it instead of checking conditions.
[disjoint] Update a comment about point on border.
Merge pull request #163 from awulkiew/fix/disjoint

Fix/disjoint
Merge pull request #152 from awulkiew/fix/convex_hull

Fix/convex hull
Merge pull request #132 from awulkiew/fix/distance_spherical

Fix/distance spherical
[doc] Update release notes.