`Logged` needs to support MPI

[TomMelt]

Currently Logged is not MPI-aware which means it will write N messages to the screen where N is mpirun -n [N].

First we should make Logged MPI-aware.

Then we should use it to output the timestep instead of the current approach in dynamics e.g.,

nextsimdg/core/src/modules/DynamicsModule/MEVPDynamics.cpp

Lines 103 to 105 in a5eb5f8

	void MEVPDynamics::update(const TimestepTime& tst)
	{
	std::cout << tst.start << std::endl;