**Changes:** - Introduced Particles.sort(...) - Introduced support for xtrack I/O buffer
0.6.2
**Changes:** - Fix issue with negative charge in longitudinal matching - Fix handling of particle weights in PyHEADTAIL interface
0.6.1
**Changes** - Minor API polishing
0.6.0
**Changes:** - Changed energy variable from psigma to ptau
0.5.9
**New feature:** - Introduced PhaseMonitor class
0.5.8
**Changes:** - Random number generator can generate Gaussian distribution. - Setters for energy variables do not change lost particles nor those for which np.nan is provided. - build_particles and and generate_matched_gaussian_bunch work correctly with pyheatail interface enabled - Fix in Particles.hide_lost_particles