g++ 4.7 -Wshadow warnings need attention

[Tom Browder <tom.browder@…>]

Following are warnings from g++ 4.7

boost/graph/detail/adjacency_list.hpp:2608:16: warning: declaration of 'tag' shadows a member of 'this' [-Wshadow]

boost/graph/detail/adjacency_list.hpp:2608:59: warning: declaration of 'tag' shadows a member of 'this' [-Wshadow]

boost/graph/graph_concepts.hpp:474:9: warning: declaration of 'g' shadows a member of 'this' [-Wshadow]

boost/graph/graph_concepts.hpp:501:9: warning: declaration of 'g' shadows a member of 'this' [-Wshadow]

boost/graph/graphviz.hpp:516:61: warning: declaration of 'dp' shadows a member of 'this' [-Wshadow]

boost/graph/graphviz.hpp:545:7: warning: declaration of 'dp' shadows a member of 'this' [-Wshadow]

boost/graph/graphviz.hpp:545:7: warning: declaration of 'node_id' shadows a member of 'this' [-Wshadow]

boost/graph/graphviz.hpp:585:9: warning: declaration of 'dp' shadows a member of 'this' [-Wshadow]

boost/graph/graphviz.hpp:585:9: warning: declaration of 'node_id' shadows a member of 'this' [-Wshadow]

boost/graph/graphviz.hpp:673:5: warning: declaration of 'errmsg' shadows a member of 'this' [-Wshadow]

boost/graph/named_graph.hpp:222:7: warning: declaration of 'extract' shadows a member of 'this' [-Wshadow]

boost/graph/named_graph.hpp:222:7: warning: declaration of 'graph' shadows a member of 'this' [-Wshadow]

boost/graph/named_graph.hpp:295:79: warning: declaration of 'vertex_constructor' shadows a member of 'this' [-Wshadow]

[Jeremiah Willcock]

(In [86680]) Changed some names to fix shadowing warnings; refs #9371

[Jeremiah Willcock]

I fixed the ones that were about local variables; using constructor parameters with the same names as the members they initialize is a standard idiom in C++ so I won't change those.