Merge branch 'develop' into feature/discrete-function-variant

doc/userdoc.org

src/language/modules/MathFunctionRegisterForVh.cpp

src/language/modules/MeshModule.cpp

src/mesh/CMakeLists.txt

src/mesh/Connectivity.cpp

src/mesh/Connectivity.hpp

src/mesh/ConnectivityBuilderBase.cpp

src/mesh/ConnectivityBuilderBase.hpp

src/mesh/ConnectivityComputer.cpp

src/mesh/ConnectivityComputer.hpp

src/mesh/ConnectivityDescriptor.hpp

src/mesh/ConnectivityDispatcher.cpp

src/mesh/ConnectivityDispatcher.hpp

src/mesh/ConnectivityMatrix.hpp

src/mesh/ConnectivityUtils.cpp

src/mesh/ConnectivityUtils.hpp

src/mesh/DiamondDualConnectivityBuilder.cpp

src/mesh/DiamondDualMeshBuilder.cpp

src/mesh/Dual1DConnectivityBuilder.cpp

src/mesh/GmshReader.cpp