Main reason for modification is the getFlux function, which for
particular processes (ComponentTransport) relies on all solutions being
available.
This modification ripples through all of the code, especially through
the boundary conditions.
Modified `applyNaturalBC`, `preTimestep`, `integrate`, and `assemble`
functions.

Passing a vector of solutions now.

preTimestep now accepts a vector of solution together with
a process_id.
In postTimestep only the vector of solutions has been changed.

Fixes multiple copyright messages in the doxygen docu.

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

Make the name schema consistent with the
implementation of other processes.

Needed for the description of the balance data.

Clang format run on near-the-header lines.

Happy New Year

 in creating of the instances of classes of coupled processes.

[HT] Modified the velocity calculation in order that it can be used for both the monolithic and staggered schemes.

[HT] Changed the name and the type of the material property member of HT, and

took the forward declaration of the type of that member.

 from the two classes of coupled term.

[Coupling] Changed the members of the coupled term,

 which only contains the solutions of the coupled equations.