[geometry] added extreme_points for multi-polygon to fix compilation in disjoint for multi polygon. Also fixed bug in multi by using within, we have to use rings_containing, that one is restored. It is now duplicated (temporary) in touches because that one has to use point_on_border still (somehow), to be found out

git-svn-id: http://svn.boost.org/svn/boost/trunk@86580 b8fc166d-592f-0410-95f2-cb63ce0dd405
[geometry] avoid warnings for multi-line comments and unused var in new sources

git-svn-id: http://svn.boost.org/svn/boost/trunk@86581 b8fc166d-592f-0410-95f2-cb63ce0dd405
Added a test for add_value manipulator. Added operator[] overloads for attibute_name as key.

git-svn-id: http://svn.boost.org/svn/boost/trunk@86582 b8fc166d-592f-0410-95f2-cb63ce0dd405
Fix an uninitialized member in a default-initialized split_iterator; Refs #9335

git-svn-id: http://svn.boost.org/svn/boost/trunk@86583 b8fc166d-592f-0410-95f2-cb63ce0dd405