[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