[intersection] avoid circulare reference in index/intersection/distance
[overlay] Added missing include / removed obsolete include,
causing unit test troubles after distance merge
[unit test] Added copyright info
[unit test] Made from_wkt inline and avoid abbreviations
[num_points][test] Added test for num_points which was not yet there
[test] added include for multi
Merge branch 'develop' of https://github.com/boostorg/geometry into feature/distance-for-merge