Make partial downloads resumable.

[jsatterfield]

curl can resume interrupted downloads.

[github-actions]

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❌ @jsatterfield
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[nathanwasson]

Hi @jsatterfield, thanks for your contribution. Can you explain your thinking here? The script uses curl to source a small metadata file that tells the script what to download. The metadata file should be downloaded every time the script is run in case there are changes to what should be downloaded, so it's not really a good candidate for the resume download function. The script already uses wget to download the actual dataset files and uses the resume feature for that.