* Seed layout basic/plot_properties.
* Seed simple path example
* Switch node cmap example to deterministic layout
* Seed layout in edge_colormap example
* Seed graph gen and layout in ego_graph example
* Seed random_geometric_graph example.
* Seed layout and pad axes w/ tight_layout.
* Seed and modify colors for directed example.
* Seeded graph gen and layout
* Switch to plasma colormap for better contrast on light bgnd
* Seed layout and tight_layout sampson example
* Seed and pad axes for unix email example
* Seed graph gen and layout for erdos_renyi example
* Seed graph gen and layout of degree_seq example
* Seed layout of football example
* Seed layout for krackhardt centrality example
* Seed davis club example
* Seed and use np alias in blockmodel example
* Seed beam search example.
* Seed random graph in eigenval example
* Seed heavy metal layout and pad axes
* Use deterministic layout for rgraph example
* Seed layout for printgraph example.
* Add seed to antigraph example.
* Use single rng seed value.
For examples with multiple uses of rng's (e.g. one for
generating a random graph, and another for layout) use a
single integer value as the seed for both.
* Remove unnecessary submodule paths from examples.