implementation, normalize A and rhs

add feature in nonlinear solver

Comment out of writing matrices for debugging

Normalize linear equation system only for rectangular shaped A Matrix

add the switch in NonlinearSolver

add feature in matMultTranspose

only when A is not square

deactivate PETSc implementation

add the check function in EquationSystem

add override functions in ODE

add override functions in TimeDiscretizedODESystem

Instead of setting the solution in the Dirichlet nodes, the solution is
enforced through the r.h.s. This usually saves one global iteration and
more importantly avoids big jumps in the first iteration for mechanics
processes.

 which are associated with the equations that do not need initial
 residual compensation, to zero.

Adding a single space in incorrectly broken lines.

This avoids a warning at the end for unused vectors.

This simplifies the TimeDiscretization interface:
pushState and popState are no longer needed. The corresponding
copies are done in the time loop.
Since the previous time step solution is no longer stored
in the time discretization, it is passed to all required
functions like assemble, getRHS and the like.

This are all but backward Euler.
The few testcases in H2-pp were updated to backward Euler
without loss of accuracy.

 - All processes using a Newton scheme are discretized
for the backward Euler scheme only. They are not usable
with other time discretizations.
 - Greatly simplifies code maintenance in this part.

Include spdlog via BaseLib/Logging.h, which
provides macro replacements for
ERR/DBUG/WARN/INFO...

This causes the time step to fail and repeated if possible.

To access the solution values a dof tables are passed
too.

Foob = out-of-balance forces.