Fixes multiple copyright messages in the doxygen docu.

ag '\\file' -L --ignore=ThirdParty *Lib |xargs  sed -i 's/\(.*\)\\copyright/\1\\file\n\1\\copyright/'

std::vector<std::size_t> _ids_of_active_elements.

for flexibility in coupling.

 VectorMatrixAssemble::assembleWithJacobian

Clang format run on near-the-header lines.

Happy New Year

 in creating of the instances of classes of coupled processes.

 from the two classes of coupled term.

[Coupling] Changed the members of the coupled term,

 which only contains the solutions of the coupled equations.

pointer to StaggeredCouplingTerm

 for the staggered scheme.

coupled terms.