## Utilities - Bug #1621: StrongType::Addable didn't work if one of theargument was constant. - Support #1622: StrongType: introduce a facility to determinate whether a class is a strong type or not. - Support #1623: StrongType: extend Comparable to encompass all the operators. - Support #1627: Numeric: extend IsZero to also work in integral types (for metaprogramming purposes). ## ThirdParty - Support #1626: MatrixPattern: add a functionality to visualize it. ## Geometry - Design #1628: Interface: decommission GetVertexCoordsIndexList(). - Support #1629: Interface: make OrderCoordsList a free function. ## FiniteElement - Support #1620: Use StrongType for NodeBearer program-wise index. ## Operators - Feature #1577: Refactor FromVertexMatching interpolator, so that it works with the Dof initialized after the reduction (it was broken in v20.52). ## Test / CI - Bug #1614: LuaOptionFile: redundancy test was working for wrong reasons... - Support #1616: create sa new stage for IWYU and clang-format. ## PostProcessing - Bug #1618: Post processing bug when more than one unknown solution is written.