for flexibility in coupling.

 for the staggered coupling scheme

 in the coupling loop.

that has or overloads the member function.

for the staggered scheme.

 HTProcess::setCoupledSolutionsOfPreviousTimeStep() before use.

 VectorMatrixAssemble::assembleWithJacobian

about getting the local solutions of an element.

 that are used for the different process in the staggered scheme

local matrices and vector for the staggered scheme

Cleanup output

For some reasons construction from an initializer list containing
{std::set, bool} does not work on MSVC and gcc-4.9 resulting in
ambigious function calls.

Also move a single piece checking the output type being
VTK.

[MPI/PETSc] Enable rank output.

[Output] Cleanup of the output logic

Fixed Qt GML writer to guarantee decimal output for coordinates