Partial MR to consider some changes of !158

See merge request !338

Resolve "linker error in clang 12"

Closes #400

See merge request !332

readthedocs and better error messages

See merge request !334

Resolve "Compiler error with QuantityVector"

Closes #398

See merge request AirShowerPhysics/corsika!331

Nikos Karastathis authored 4 years ago and Maximilian Reininghaus committed 3 years ago

fixed -=, +=, *=, /= operators in QuantityVector.hpp and .inl (please check if this modification is really needed)

Resolve "Replace std::experimental::filesystem with boost::filesystem"

Closes #404

See merge request AirShowerPhysics/corsika!336