lucy: Really useful things done with graphs.

update_vertices performs propagation on vertices. updateEdges performs propagation on edges.

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update_vertices(g, get_determiners, callback, verbose = FALSE)

update_edges(g, get_determiners, callback, verbose = FALSE)

`g`	A graph object.
`get_determiners`	A function returns the vertice/edge indices that must be updated for the callback to be executed. Arguments: g - the graph object, i - the index of a vertex/edge in g. Returns: an array of indices for the vertices/edges that are needed to perform the callback on vertex/edge i.
`callback`	The function performed on each vertex/edge. Arguments: g - the graph object, i - the index of a graph/edge in g. Returns: a graph object.
`verbose`	if TRUE prints out details of propagation