v0.7

• Renamed functions graphviz_graph and graphviz_render to create_graph and render_graph, respectively
• Removed function graphviz_export (exporting now handled with render_graph)
• Added several new functions to inspect, analyze, and modify graphs: display_graph_object, node_info, edge_info, node_present, edge_present, get_nodes, get_edges, get_predecessors, get_successors, node_count, edge_count, is_graph_empty, is_graph_directed, add_node, add_edges, delete_node, delete_edge, node_type, edge_relationship, create_series, add_to_series, remove_from_series, graph_count, subset_series, trigger_script, render_graph_from_series, series_info