Merge branch 'master' into fix_thcovmat_fit

doc/sphinx/source/serverconf/index.md

doc/sphinx/source/tutorials/APPLgrids.md

doc/sphinx/source/vp/theorycov/examples.rst

doc/sphinx/source/vp/theorycov/runcard_layout.rst

doc/sphinx/source/vp/upload.md

doc/validphys2/guide.md

libnnpdf/nnprofile.yaml.in

n3fit/src/n3fit/hyper_optimization/hyper_scan.py

n3fit/src/n3fit/hyper_optimization/penalties.py

n3fit/src/n3fit/io/writer.py

n3fit/src/n3fit/performfit.py

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

n3fit/src/n3fit/tests/test_losses.py

n3fit/src/n3fit/tests/test_vpinterface.py

n3fit/src/n3fit/vpinterface.py

...amples/theory_covariance/covariance_matrix_plots_3pt.yaml

...heory_covariance/covariance_matrix_plots_9pt_reduced.yaml

...ys2/examples/theory_covariance/validation_report_3pt.yaml

...ys2/examples/theory_covariance/validation_report_9pt.yaml

validphys2/serverscripts/index-reports.py