Added VF2 updates from Flavio De Lorenzi

svn path=/trunk/boost/graph/; revision=82050
Trying to fix defaults for StoredEdge; refs #7801

svn path=/trunk/boost/graph/; revision=82052
Applied variant of patch from #7845; fixes #7845

svn path=/trunk/boost/graph/; revision=82358
Added more examples to Jamfile

svn path=/trunk/libs/graph/; revision=82438
Changed to iterator_property_map; fixes #7877

svn path=/trunk/libs/graph/; revision=82439
Removed obsolete workaround

svn path=/trunk/libs/graph/; revision=82440
Removed obsolete workarounds and changed to iterator_property_map; refs #7877

svn path=/trunk/libs/graph/; revision=82441
Changed loop header to avoid GCC warning from -Wunsafe-loop-optimizations

svn path=/trunk/boost/graph/; revision=82445
Added check to prevent use of remove_vertex on named adjacency list graphs with vecS vertex container (since it does not work and could not be made to work efficiently); refs #7863

svn path=/trunk/boost/graph/; revision=82498