[within] Fix non-cartesian points handling in winding strategy, case when Point's latitude is between Segment's Points latitudes.
[test][within] Add tests for special cases in spherical CS (some failing)
Merge pull request #134 from awulkiew/fix/winding_spherical

Fix/winding spherical
[overlay] change comment
Merge branch 'develop' of github.com:boostorg/geometry into develop
[buffer] fix adding piece for side with a range, the intermediate range points were
not added (there is not yet a strategy doing this). Share functionality for adding
a range
[buffer] helper_points (formerly called helper_segments) are now optional
and we rescale/finish the piece on the fly and not in a separate call
[buffer] fix cases where intersection point falls between robust piece
and non-robust original. We now check robust representions of originals
where this cannot happen
This fixes rt_u9
This obsoletes turn_in_input
[buffer] add comments