Fixing bug 'particlefile.time.calendar' not recognised by xarray
Fixing bug 'particlefile.time.calendar' not recognised by xarray

Rather than the parcels-specific `’np_datetime64’`, we now set it to
`’standard’`, so that array does recognise it with `decode_cf=True`

OceanPARCELS/parcels,OceanPARCELS/parcels