1-SPECTRAL CLUSTERING - Version history
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V1.0: 
- initial release

V1.1: 
- fixed bug occuring when input graph is disconnected
- reduced memory usage when input graph has large number of disconnected components
- more user-friendly usage of main method OneSpectralClustering
- faster computation of eigenvector initialization + now thresholded according to multicut-criterion
- several internal optimizations
