Parcels

Parcels v2.3.1 builds upon previous versions of Parcels and specifically introduces the following new (minor) features:

• Support to save Parcels output in zarr format (#1165)
• Automatically compress temporary *.npy files with gzip (#1171 by @JamiePringle)
• Support for curvilinear MITgcm-like indexing (#1166 by @daanreijnders)
• Switching to tqdm for the progressbar (#1111)
• Support for installation of Parcels via a pypi package (#1163 by @gmaze)
• Extended netcdf export format dictionary to unsigned ints (#1152 by @nvogtvincent)
• Support for periodic boundaries in InteractionKernels (#1096 by @pdnooteboom)

Furthermore, it fixes a number of bugs; most notably #1072, #1089 (fix by @daanreijnders), #1105 (fix by @cpierard), #1113 (fix by @nvogtvincent), #1175, #1182 (fix by @ocefpaf)