Doc. Update biblio. Renaming

docs/sphinx/hysop.bib

docs/sphinx/users_guide/biblio.rst

docs/sphinx/users_guide/develnotes.rst

docs/sphinx/users_guide/domains.rst

docs/sphinx/users_guide/fields.rst

docs/sphinx/users_guide/forces.rst

docs/sphinx/users_guide/index.rst

docs/sphinx/users_guide/introduction.rst

docs/sphinx/users_guide/modules.rst

docs/sphinx/users_guide/operators.rst

docs/sphinx/users_guide/penalisation.rst

docs/sphinx/users_guide/poisson.rst

docs/sphinx/users_guide/redistribute.rst

docs/sphinx/users_guide/subsets.rst

docs/sphinx/users_guide/topologies.rst