- Feature #950: In VariationalFormulation, extend the interface of ApplyBoundaryCondition to enable both pseudo-elimination and penalization. - Support #951: Improve interface of ShellMatrix. - Bug #949: A recent change in LocalVariational operator Crtp was not correctly reported in GlobalParametersOperators (not featured in current integration tests). - Bug #952: Fix a bug in Singleton destruction sequence (that was already seen and clumsily fixed in #739 and #740). Ongoing tickets: - Feature #820: Poromechanics Gmres loop dH in progress. Note: In integration test, Stokes failed in parallel in both debug and release mode with gcc. The problem is not consistent: it occurs only during some runs, while the other yield the expected result. It is likely to be related to the versions of third party librairies used with gcc; a ticket (#953) has been opened to investigate it.