Workaround for __BIGGEST_ALIGNMENT__ on Clang

See merge request walberla/walberla!458

On x86_64, this is always 128 bits, rendering it incompatible with AVX.
GCC reports the maximum enabled vector width (which is what we want) and Intel reports the maximum supported vector width (which is okay too).

Fixed possible divide by zero in mesh vtk writer and added case to test

See merge request walberla/walberla!455

Fixed ordering of cmake commands

See merge request walberla/walberla!454

Minor cmake fixes

See merge request walberla/walberla!452

Jinja2 3.0 compatibility

See merge request walberla/walberla!453

fix namespace of hasing function

See merge request walberla/walberla!450

Force use of std::experimental::filesystem with GCC 8

See merge request walberla/walberla!449

Code Generation for Lattice Boltzmann In-Place Streaming Patterns

See merge request walberla/walberla!446

Field alignment on ARM

See merge request walberla/walberla!448

Add 5.1 changes to changelog.md

See merge request walberla/walberla!447

Tutorials and documentation maintenance

See merge request walberla/walberla!444

FIX: SP/DP conversion warnings

Closes #144

See merge request walberla/walberla!442

added asserts to ensure interactionRadius is set properly

See merge request walberla/walberla!439

Boundary Conditions Tutorial

See merge request walberla/walberla!443

Test generated fluctuating MRT LB momentum balance

See merge request walberla/walberla!355

Add showcase for simulation of flow through porous media

See merge request walberla/walberla!441

[ADD] film specimen app

See merge request walberla/walberla!423