adding cheb, mp struct dataset and ss reconstruction

Author: dmoi

foldtree2/notebooks/benchmarks/treelikelihood_info_theory_benchmark.ipynb

@@ -49194,18 +49194,6 @@
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foldtree2/notebooks/experiments/test_fapeloss.ipynb

@@ -1184,18 +1184,6 @@
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    "name": "python3"
-  },
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