[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][distance] check distance against 0 only when the minimum
distance is updated
[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
[doc][support status] fix typo: num_interior_rings should have been num_points
[doc][support status] add algorithms is_simple and is_valid
Merge branch 'develop' of https://github.com/boostorg/geometry into feature/num_segments
Merge pull request #97 from mkaravel/fix/support_status

Fix/support status
Merge pull request #96 from mkaravel/feature/distance

Optimize distance computations for multi-to-multi and single-to-multi
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;
[doc] Move the description of WKT one level above and add info about the output of non-OGC geometries