Benchmark scoper vs DefineClones and light_cluster

[ssnn]

We need to benchmark scoper and DefineClones, and identify and document any differences prior deprecation of DefineClones. Benchmark as well with large datasets. See also #changeo/147. Same for light_cluster.py. Then update tutorials.

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[Roy Jiang]

@Meng Wang General task: for some of your datasets, runtime vs size (number sequences, subsample). Generate the plot for scoper defineClones changeo defineClones.py