[test][algorithms] add unit test for num_segments algorithm
[algorithms][num_segments] add num_segments algorithm: computes
the number of segments in a geometry (including geometry variants)
[algorithms][num_segments] add doxy/qbk documentation
[geometry] include algorithm num_segments
[test][algorithms] include unit test for num_segments in Jamfile
[doc][num_segments] add group for num_segments algorithm
[doc] add num_segments algorithm
[doc] add num_segments algorithm
[doc] add qbk documentation for num_segments algorithm
[doc][support status] add num_segments algorithm
[doc][examples] add example for num_segments algorithm
Merge branch 'develop' of https://github.com/boostorg/geometry into feature/num_segments
Merge branch 'develop' of https://github.com/boostorg/geometry into feature/num_segments
[doc][examples][num_segments] use an open polygon instead of a closed one;
call also num_segments with the second (optional) argument set to true;
Merge branch 'develop' of https://github.com/boostorg/geometry into feature/num_segments
Merge branch 'develop' of https://github.com/boostorg/geometry into feature/num_segments
Merge branch 'develop' of https://github.com/boostorg/geometry into feature/num_segments
Merge branch 'develop' of https://github.com/boostorg/geometry into feature/num_segments
[doc][examples][num_segments] remove unnecessary includes
[doc][examples][num_segments] replace example multi-polygon by a valid one