initialTau: compute intial values for tau
In noisySBM: Noisy Stochastic Block Mode: Graph Inference by Multiple Testing

returns a list of length nbOfTau of initial points for tau using spectral clustering with absolute values, kmeans and random perturbations of these points

1	initialTau(Q, dataMatrix, nbOfTau, percentageOfPerturbation, directed)

`Q`	number of latent blocks in the noisy stochastic block model
`dataMatrix`	observed dense adjacency matrix
`nbOfTau`	number of initializations for the latent block memberships
`percentageOfPerturbation`	percentage of node labels that are perturbed to obtain further initial points
`directed`	booelan to indicate whether the model is directed or undirected