Fix problem with global attribute values. These should have non-empty values iff every graph defines the attribute and all the values agree; initialize GD_has_labels for the clone graph as the "or" of this value for all input graphs.
Fix problem with global attribute values. These should have non-empty
values iff every graph defines the attribute and all the values agree;
initialize GD_has_labels for the clone graph as the "or" of this value
for all input graphs.

kbrock/graphviz,BMJHayward/graphviz,pixelglow/graphviz,MjAbuz/graphviz,BMJHayward/graphviz,pixelglow/graphviz,pixelglow/graphviz,jho1965us/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,BMJHayward/graphviz,kbrock/graphviz,tkelman/graphviz,pixelglow/graphviz,BMJHayward/graphviz,MjAbuz/graphviz,pixelglow/graphviz,kbrock/graphviz,MjAbuz/graphviz,tkelman/graphviz,MjAbuz/graphviz,BMJHayward/graphviz,kbrock/graphviz,jho1965us/graphviz,pixelglow/graphviz,jho1965us/graphviz,tkelman/graphviz,ellson/graphviz,kbrock/graphviz,tkelman/graphviz,tkelman/graphviz,jho1965us/graphviz,MjAbuz/graphviz,MjAbuz/graphviz,jho1965us/graphviz,BMJHayward/graphviz,jho1965us/graphviz,MjAbuz/graphviz,tkelman/graphviz,kbrock/graphviz,ellson/graphviz,BMJHayward/graphviz,jho1965us/graphviz,kbrock/graphviz,ellson/graphviz,kbrock/graphviz,jho1965us/graphviz,tkelman/graphviz,ellson/graphviz,ellson/graphviz,jho1965us/graphviz,BMJHayward/graphviz,pixelglow/graphviz,MjAbuz/graphviz,MjAbuz/graphviz,tkelman/graphviz,ellson/graphviz,BMJHayward/graphviz,tkelman/graphviz,MjAbuz/graphviz,jho1965us/graphviz,BMJHayward/graphviz,kbrock/graphviz,tkelman/graphviz,pixelglow/graphviz,pixelglow/graphviz,pixelglow/graphviz,tkelman/graphviz,pixelglow/graphviz,jho1965us/graphviz,kbrock/graphviz,MjAbuz/graphviz,ellson/graphviz,BMJHayward/graphviz,kbrock/graphviz,ellson/graphviz