Adding a single space in incorrectly broken lines.

Especially useful when all nonlinear iterations should
be output. See <output_iteration_results> tag.

 assembler member function.

For the staggered coupling some additional work has
to be done in the same scope of the remaining code.

The call to preTimestep uses internally Process::_coupled_solutions
which is a pointer to an object of type
CoupledSolutionsForStaggeredScheme.
This variable is set by setCoupledSolutionsForStaggeredScheme()
using the address of a *local* variable that will
be destroyed when the execution of the code is out
of the scope. For this reason the call to
preTimestep have to be inside the same scope.

Fixing a matrix-vector provider warning for non-fr

Fixing a matrix-vector provider warning for non-freed vector.

This is preparation for the PETSc nonlinear solver.
There we need different (from Picard) behaviour in
the Newton tag case.

In the processes the postTimestep is also used to store local variables
for the next time step. Computation of secondary variables and other
local quantities is done in the computeSecondaryVariables.
Changing the order prevents that values from last iteration (not from
final solution) are stored for the next timestep.

Interface and time loop changes. Processes are in the
next commit.