Fix plot_phasespacedata and plot_profiledata
Change color map for streak plots for plot_profiledata, plot_wakedata, plot_cavitydata

Multiple hdf5 file can now be made without having to use MPI. This is achieved by clearing the file name storage every time the monitor is closed.

Allow to plot detuning, tuning angle and powers from tracking.

Fix error on plot_beamdata.
Add option to specify ylim to streak_bunchspectrum and to streak_beamspectrum.

Add a is_empty property to the Bunch class.
Add a check_empty optional parameter to the Monitor.track_bunch_data method.
ProfileMonitor: if the bunch is empty, no profile is saved.
WakePotentialMonitor: if the bunch is empty, the same from last good turn is saved.
BunchSpectrumMonitor: if the bunch is empty, the incoherent spectrum is nan.

libver='earliest' allow for better backward compatibility when switching HDF5 versions.

Convert h5py data into numpy arrays as fancy indexing is broken in h5py >= 3.1.0

Fixed error on the computation of the beam size with dispersion in Synchrotron.sigma method.
Add import of plot_beamspectrum and streak_beamspectrum

Fix BeamSpectrumMonitor
Add plotting functions for BeamSpectrumMonitor

Add plot_bunchspectrum and streak_bunchspectrum
Fix bug (double plot) in plot_bunchdata
Remove plot_tunedata

Remove TuneMonitor (remplaced by BunchSpectrumMonitor).
Remove default values for save_very, buffer_size, total_size.
Set default value for mpi_mode to False.
Add "xtau"/"ytau" choices for Bunch/BeamSpectrumMonitor classes.
Set default value for n_fft to None to avoid zero-padding by default.
Fix WakePotentialMontior n_bin (x2) problem.

Fix for BeamSpectrumMonitor and BunchSpectrumMonitor with merge_files

Add a monitor for the coherent beam spectrum (i.e. coupled bunch modes).
Add utility functions to BunchSpectrumMonitor to know the fft and signal resolution.
Save the frequency samples for BunchSpectrumMonitor in the hdf5 file.

Allow to monitor coherent and incoherent bunch spectrums.

Rework plot_beamdata and plot_bunchdata to be able to plot multiple hdf5 files at the same time
New function streak_beamdata to separate the streak plot option.

Beam.mpi_share_distributions is now moved to mpi.share_distribution
Now mpi4py is only needed for the multi-bunch tracking and not for single bunch

Add options to plot beamdata vs index and in streak plot mode
Add setting of colorscale for plot_cavitydata

Fix bug when buffer_size=1 in TuneMonitor by switching to init buffer_count to 0. Now total_size should be 1 less.
Improve plot_tunedata

Fix plot_profiledata error due to change to center instead of bins
Fix plot_cavitydata legends and turn selection

Fix profile monitor
Add detune to cavity monitor

Add a dict_dtype optional parameter to Monitor.monitor_init to allow to choose the dtype to use to save the data.
Improve CavityMonitor to allow for saving beam and cavity phasor for all bunches
Add a plot_cavitydata function
Fix a bug on CavityResonator.track -> nturn += 1 at correct time
Change CavityResonator.track to allow for monitoring the cavity/beam phasor at each bunch

Change back invariant name to cs_invariant
Simplify SkewQuadrupole track method

Add tracking to CavityResonator based on the mbtrack implementation but using a analytic formula for speed-up
Add method to Beam to share longitudinal distributions
Add methods to Mpi to look for next and previous bunches
Add start of a CavityMonitor, to improve to deal with multi-cores

Remove for-loops inside the function.

- cs_invariant method in Bunch is renamed to 'action'.
- Action is now saved together with BunchMonitor and can be plotted in plot_bunchdata