geometry.index: nearest() predicate point relations shielded by BOOST_GEOMETRY_INDEX_DETAIL_EXPERIMENTAL.

git-svn-id: http://svn.boost.org/svn/boost/trunk@84170 b8fc166d-592f-0410-95f2-cb63ce0dd405
Fixed doc generation by eliminating header files no longer being used.

git-svn-id: http://svn.boost.org/svn/boost/trunk@84171 b8fc166d-592f-0410-95f2-cb63ce0dd405