The condition substituting nextIteration() is different than in the
method itself, because incrementing the iteration counter is avoided.

This will ensure that in verbose mode, the final state of the linear
system solvers is always printed. Previously this was the case only when
refresh rate was equal to 1.

Scripts tnl-compile and tnl-link were added.

Parallel reduction in CUDA fixed.
Boundary conditions in linear system assembler fixed.
Min. iterations for linear solvers fixed.

Fixing the solvers.

TNL can be compiled without CXX11 support.

so far).