add longitudinal track method when reading from wake table, take beam loading theorem into account for longitudinal wakes from wake table (lonigutindal wake in front is neglected)
final adjustments after the merge with Kevin's branch, change input from GeV to eV for energy, change mass definition in input from 1 for protons to e
adabt bunch creation to the new definitions in BenchMark_BBresonator.py, add default value of 1 to stride in monitors/monitor.ParticleMonitor
add BenchMark_BBresonator_longitudinal.py
Correct dtype=int in bunch.id for Bunch and ParticleMonitor.
Touch up bunch; work on Poisson solver; add cython functions for grid computations.