Added time_origin to output netcdf file
Added time_origin to output netcdf file

Using the time_origin also for the time.units netcdf attribute in the
trajectory output file.

Note that ideally this will be taken from grid.U.time_origin when
ParticleFile is called, but I don’t think ParticleFile has access to
grid

OceanPARCELS/parcels,OceanPARCELS/parcels