These tests are failing on testing machines.

The different tangent types used for the tangent stiffness computation.

Output primary variables on arbitrary meshes.

The functionality of the ProcessVariable isn't needed here.

Otherwise the submodule setup fails.

[J] Updated lib: build()-step will fail correctly when using pipes.

Boost update to 1.66.0

Bumped Boost to 1.66.0.

https://bincrafters.github.io/2017/09/22/boost-modular-packages-conan/

This cleans dirty states in submodules which may happen when a
non-existing submodule hash was referenced.

Makes sure to always have the submodule at the desired state.

LIE intersect (continued).

clang-tidy '*readability-braces-around-statements'

No underscore for public members;
Drop type prefix from the name.