Finish refactoring and migration. Add tutorial

eval/plot.py

eval/testing.py

eval/testingFederated.py

eval/testingPeerSampler.py

logs/config_celeba_sharing.ini

src/decentralizepy/node/DPSGDNode.py

src/decentralizepy/node/DPSGDNodeFederated.py

src/decentralizepy/node/DPSGDWithPeerSampler.py

src/decentralizepy/node/FederatedParameterServer.py

src/decentralizepy/sharing/Sharing.py

src/decentralizepy/sharing/Wavelet.py

src/decentralizepy/train_test_evaluation.py

src/decentralizepy/utils.py

tutorial/96_nodes_random1.edges

tutorial/96_regular.edges

tutorial/ip.json

tutorial/run_decentralized.sh

tutorial/run_federated.sh