[overlay][relate][is_valid][buffer] Remove other_id from turn_operation.
[overlay][is_valid] Replace int with signed_index_type for segments indexes.
[overlay] Move signed_index_type to separate file. Clean headers in ring_ and segment_identifier.hpp.
[test][setops] Fix invalid namespace in test_get_turns_ll_invariance.
[point_on_surface] Use arithmetic mean instead of centroid(bashein-detmer).
[test][point_on_surface] Add test for Polygon using big coordinates (ticket 10643)
[test][point_on_surface] Add test for Polygon containing non-uniformly distributed points.
Merge pull request #154 from awulkiew/fix/point_on_surface

Fix/point on surface
Merge pull request #153 from awulkiew/feature/refactor_turns

Overlay/Turns refactorization
[point_on_surface] Remove unneeded function.
[test][point_on_surface] Add missing closing Point in on of the tests.
[doc] Update release notes.
[doc] Update release notes.