assembler member function.

 the staggered scheme

This is going to replace one part of the local_coupled_solutions
object.

Pass through the interface to avoid the coupled_xs
in the feature.

Eliminate two single-line functions.

Pass process_id to FEM::assemble calls.

Exemplary on SmallDeformationProcess, storage of dt
is no longer required and the assembly can be repeated
without dependency on the t/dt values.

Fixes multiple copyright messages in the doxygen docu.

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

clang-tidy modernize-loop-convert check.

for flexibility in coupling.

 for the staggered coupling scheme

for the staggered scheme.

 VectorMatrixAssemble::assembleWithJacobian

Clang format run on near-the-header lines.

Happy New Year

 from the two classes of coupled term.

[Coupling] Changed the members of the coupled term,

 which only contains the solutions of the coupled equations.

In some processes (using non-local methods, for example)
the assembly is split in two parts: computation of local
quantities and actual (non-local) assembly (integration)
into the local matrices.