put ParticleCut at end of ProcessSequence for all examples

Fixes #582 (closed)

Like we have discussed in todays technical call, this puts the ParticleCut process at the very end of all process sequences.

From my understanding, the position of cut in the process sequence should only be relevant in relation to processes that change the energy of the particle, which are the processes producing continuous energy losses. By putting the cut process at the very end, we can ensure that this is always true.