Meta issue for deal.II 6th Users and Developers workshop.

[luca-heltai]

All issues and merge requests opened during the deal.II 6th Users and Developers workshop.

• Update funding sources on the website #6945

• Provide "showcase" applications on the website #6946

• "Features" tab on the website #6947

• Showcase picture for each tutorial program #6948

• Added checks on distributed vectors for interpolate #6964

• AD Helpers: Add helper for residual linearisation (cell-level) #6978

• AD Helpers: Introduce base class for QP-level helper classes #6979

• AD Helpers: Add helper for scalar functions (QP-level) #6980

• AD Helpers: Add helper for vector functions (QP-level) #6981

• AD Helpers: Add tests #6982

• More fixes to AD drivers classes #7010

• Fix reference to step-18 in documentation #6989

• add test for examples/step-56 #6988

• Rename petsc_parallel_* headers to petsc_* #6986

• add a FiniteSizeHistory class to store objects #6984

• AD Helpers: Add helper for variational formulations (cell-level) #6977

• AD Helpers: Introduce base class for cell-level AD helper classes #6976

• AD Helpers: Introduce base class for AD helper classes #6975

• example/step-15: Update indenting and modernize #6974

• Improved description compute point locations #6971

• Save the locally owned rows in TrilinosWrappers::SparsityPattern #6968

• Boost bounding box #6967

• Restrict tests requiring p4est #6966

• Change step-16: add alternative without MeshWorker #6965

• Fix indentation for 'tests/hp/fe_collection_05'. #6962

• Make it even clearer that a function is 'virtual'. #6958

• Update the documentation of GridTools::extract_used_vertices(). #6957

• Avoid warning regarding unused variable in SolutionTransfer::unpack_callback #6955

• Ignore deleted files when formatting #6953

• Match doxygen markup in the .cc file to that in the .h file. #6952

• Update the documentation of hp::FECollection::find_least_face_dominating_fe(). #6951

• Added boost::point adaptor #6950

• Avoid #warning using MSVC #6949

• Add new constructor to function parser #6944

• Add AD number static asserts for FullMatrix and Vector classes. #6943

[davydden]

alternatively, next time we could add a dedicated label.