Merge remote-tracking branch 'origin/feature' into 225-fix-prestress

src/elasticity/assemble/DGElasticity.cpp

src/elasticity/assemble/EGElasticity.cpp

src/elasticity/assemble/LagrangeElasticity.cpp

src/elasticity/assemble/LagrangeElasticity.hpp

src/elasticity/problem/BeamProblems.hpp

src/elasticity/problem/DynamicBoundaryProblems.cpp

src/elasticity/solvers/IterativePressureSolver.cpp

test/elasticity/CMakeLists.txt