Implement download resumption in humann_databases

[kmlhpk]

I tried to follow Step 5 of "Initial Installation", and ran into an issue with the command humann_databases --download chocophlan full <path>. Namely, after ~15m of downloading the download failed with the following error: CRITICAL ERROR: Unable to download and extract from URL: http://huttenhower.sph.harvard.edu/humann_data/chocophlan/full_chocophlan.v201901_v31.tar.gz. I tried this command 4 times, with each attempt resulting in an error. It appears other users have had similar issues downloading from the default file-hosting URLs: https://forum.biobakery.org/t/difficulty-downloading-databases-in-humann3/1343 Considering the size of the dataset, and thus the time it takes to download, trying again from scratch seems inefficient.

If possible, it would be good to enable resumption functionality similar to wget -c, where the download utility can pick up from where it was interrupted.

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