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Peter W. Draper authored
One major change to replace all gpart id/parts with the new id_or_neg_offset. As discussed in #123, this merge request changes the `gpart.id` and `gpart.part` anonymous union into a single `long long int id_or_neg_offset`. If this number is positive, then it is the particle ID and the `gpart` has no hydro counterpart. If this number is negative, then it is the offset in the `parts` array of this particle's hydro counterpart. See merge request !118
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