Merge branch 'develop' into euler

CMakeLists.txt

build

src/CMakeLists.txt

src/TNL/Communicators/MpiCommunicator.h

...al/Hamilton-Jacobi/Solvers/hamilton-jacobi/CMakeLists.txt

...Hamilton-Jacobi/Solvers/hamilton-jacobi/MainBuildConfig.h

...acobi/Solvers/hamilton-jacobi/tnl-direct-eikonal-solver.h

...ilton-Jacobi/Solvers/hamilton-jacobi/tnl-run-fsm-eoc-test

...obi/Solvers/hamilton-jacobi/tnlDirectEikonalMethodsBase.h

...olvers/hamilton-jacobi/tnlDirectEikonalMethodsBase_impl.h

...-Jacobi/Solvers/hamilton-jacobi/tnlDirectEikonalProblem.h

...bi/Solvers/hamilton-jacobi/tnlDirectEikonalProblem_impl.h

...on-Jacobi/Solvers/hamilton-jacobi/tnlFastSweepingMethod.h

...bi/Solvers/hamilton-jacobi/tnlFastSweepingMethod1D_impl.h

...bi/Solvers/hamilton-jacobi/tnlFastSweepingMethod2D_impl.h

...bi/Solvers/hamilton-jacobi/tnlFastSweepingMethod3D_impl.h

src/TNL/Math.h

src/TNL/Meshes/DistributedMeshes/DistributedGrid.hpp

src/Tools/tnl-diff.h