* [GRAPH_GENERIC,SC] Relocated edge_components/4, edges_to_vertices/2.
* [GRAPH_GENERIC,SC] Added wrapper edge_components/3.
* [OPTION_EXT,NEW] Added merge_options/2.
* [OPTION_EXT,NEW] Added nvpair/3 for taking two representations for name/value-pairs apart.
* [OPTION_EXT,EXT] Use of nvpair/3 for parsing individual options.