Merge pull request #916 from NNPDF/hyperopt_extras

doc/sphinx/source/n3fit/hyperopt.rst

n3fit/runcards/Basic_hyperopt.yml

n3fit/src/n3fit/ModelTrainer.py

n3fit/src/n3fit/backends/keras_backend/MetaModel.py

n3fit/src/n3fit/checks.py

n3fit/src/n3fit/hyper_optimization/plotting.py

n3fit/src/n3fit/hyper_optimization/rewards.py

n3fit/src/n3fit/io/writer.py

n3fit/src/n3fit/performfit.py

n3fit/src/n3fit/stopping.py

n3fit/src/n3fit/tests/regressions/hyper-quickcard.yml

n3fit/src/n3fit/tests/regressions/noval-quickcard.yml

n3fit/src/n3fit/tests/test_hyperopt.py