Moved parts of PBGL used by parallel property maps over to property map directories and namespaces; this fixes circular dependencies between these two libraries (assuming boost/property_map/parallel is treated as a separate library)

[SVN r86381]
Applied patch from #9127 to fix lazy_add_vertex; fixes #9127

[SVN r86515]
Merge branch 'master' into develop
Merge branch 'develop'