[doc][convex hull] fix complexity
[doc][implementation status] add is_simple and is_valid algorithms
[doc][is_simple] add support status
[doc][is_valid] add support status
[doc][is_simple] add complexity for multi-points
[doc][is_valid] update complexity section
[doc][distance] update support status
[doc][distance] update complexity section
[doc][comparable distance] update complexity section (same as distance)
[doc][comparable distance] add support status
[doc][comparable distance] remove sentence regarding the non-existence of version with strategy
(such a version now exists)
Merge pull request #98 from mkaravel/doc/convex_hull

[doc][convex hull] fix complexity
Merge pull request #99 from mkaravel/doc/implementation_status

[doc][implementation status] add is_simple and is_valid algorithms
Merge pull request #100 from mkaravel/doc/is_simple

Doc/is simple
Merge pull request #101 from mkaravel/doc/is_valid

Doc/is valid
Merge pull request #102 from mkaravel/doc/distance

Doc/distance
[algorithms][relate] add missing includes; qualify binary_search with std:: namespace
Merge pull request #103 from mkaravel/fix/relate

Algorithms / relate
[doc][buffer] add buffer (and corresponding strategies) to reference matrix;
modify the appearance of the strategies section of the reference matrix to have 3 columns;
[doc][disjoint] update support status