PySDM v2.0

tada:

• Monte-Carlo super-particle-number-conserving collisional breakup representation
  (original algorithm and implementation by @edejong-caltech and @jb-mackay)

misc:

• Lowe et al. 2019 (Pruppacher & Klett) diffusion kinetics/thermics & latent heat formula (thanks @claresinger)
• Lowe 1977 saturation vapour pressure formulae (thanks @claresinger)
• Murphy and Koop 2005 saturation vapour pressure formulae (thanks @isilber)
• new product: FlowVelocityComponent
• new spectra: Gamma & Gaussian (thanks @edejong-caltech)
• fixing race condition in coalescence counter increments (thanks @jb-mackay)
• fixing non-rectangular domain handling in VTK exporter
• switch from SciPy to PySDM backend root-solver in CompressedFilmRuehl surface tension (thanks @claresinger)
• swithing to use single buffer for all products (less memory allocated)
• better unit-test coverage for physics formulae incl. units (thanks @claresinger)