Parcels v2.3.0: a Lagrangian Ocean Analysis tool for the petascale age

Parcels v2.3.0 builds upon previous versions of Parcels and specifically introduces four new features:

• Prototype implementation of Particle-Particle interaction in Scipy mode (#1031, thanks to @qubixes and @RoelBrouwer ).
• Implementation of Particle-Field interaction in Scipy mode (#1045, thanks to @fedeguerr)
• Implementation of a second type of ParticleSet (Array-of-Structures, ParticleSetAOS) as addition to the default Structure-of-Arrays (ParticleSetSOA) (#999)
• Partial- and free-slip boundary interpolation methods for velocity fields on A-grids (#1052, thanks to @reint-fischer )

Furthermore, it includes a few minor bug fixes and removes some of the non-relevant logger Info/warning messages (such as when casting lon and lat to np.float32) (#1022)