v0.4.0

What's Changed

• Fix unsafe id()-keyed matrix cache and stale recompute by @finsberg in #64
• Initial support for interpolation by @jorgensd in #63
• Dokken/interpolate expression by @jorgensd in #66
• Finsberg/interpolate expression by @finsberg in #65
• Implement linear combination assignment by @jorgensd in #62
• Add nonmatching interpolation operator and demo by @jorgensd in #68
• Finsberg/nonmatching interpolation by @finsberg in #69
• Time-distributed control + blocked rewrite. by @jorgensd in #75
• Support blocked linear systems. by @jorgensd in #73
• Various fixes to nonlinear solve. by @jorgensd in #72
• Attach adjoint LinearSolver/Nonlinearsolver objects to original solver class. by @jorgensd in #77
• Merge NonlinearProblem and LinearProblem block base classes by @jorgensd in #78
• Mypy fixes by @jorgensd in #82
• Replace third order taylor test with finite difference check of hessian against gradient by @jorgensd in #84
• Add example that illustrates how to use submeshes with DOLFINx-adjoint by @jorgensd in #80
• Document the knowledge repository and the agent setup by @finsberg in #74
• Less strict tolerance in hessian convergence test by @finsberg in #85
• Sort coefficients for placeholder creation by @jorgensd in #86
• Support checkpointing of time-dependent adjoints by @finsberg in #71
• Cover the gradient at a re-evaluated control under a schedule by @jorgensd in #87
• Add comment regarding mpi communicators. by @jorgensd in #88
• DirichletBC control by @jorgensd in #83
• Topology optimization example by @jorgensd in #81
• Improve docs of top opt with pyvista rendering by @jorgensd in #92
• Fixes for api changes in DOLFINx by @jorgensd in #94
• Fixes for mesa on CI by @jorgensd in #95
• fenicsx compat by @finsberg in #101

Full Changelog: v0.3.0...v0.4.0