Re-enable code coverage

Small fixes.

[PL] Multi-component transport process

cppcheck

Iteration number based time stepping

ogs-[git tag]-[number of commits since tag]-[git hash]-...

First removal force the convergence checks to be executed.
Last two changes handle the t being (almost) equal to the
end time.

Change the way a multiplier is computed, s.t. for
a set of iterations and multipliers as:
i = 5 8 10
m = 2 1 0.5
following multiplier is taken
m(<5) = 2
m(5-7) = 2
m(8-9) = 1
m(>=10) = 0.5

This is easier to comprehend in the project files.

Otherwise the timestepper will repeat the second iteration
of the first time step with the initial_dt and simulation will
be aborted. In the current implementation the minimum dt
will be taken for the second iteration.

Check vector sizes.