Issue 300

[kaiiam]

With @Anoosha-Sehar showing how to do a branch and merge workflow based on the ENVO protocol adding a few simple changes to the animal parts template.

[kaiiam]

The example here changed the animal parts tsv file definitions for animal material and substance but the results in the final output don't actually change because it was the special case of pig/pork cow/beef which was already working for those lines. It is not more correct though so this could be merged. Finally the reason there is such a large diff (365 additions and deletions) after just having modified 2 lines is that we now did it with excel on a mac. Previously I had saved animal_parts.tsv with libre office. So I'm guess the line endings changed and made github freekout with the large difs. From now on we can prevent this issue by only using excel on a mac to edit the tsv files.

This PR should be safe to merge, however, it's not strictly necessary @ddooley whatever you prefer. I think we should as it did fix the issue with the diffs, and we also did change the tsv (even if the output didn't change).

[ddooley]

The {animal} to {animal base} has been implemented in intermediate commits, and for now the workflow is a copy from Google Sheets to the animal_parts.tsv file so we don't have to address the mac/excel issue. So I think this can be safely closed.