[WIP] Configure datachallenge/quicklook

[weaverba137]

This PR:

• Closes backup datachallenge/quicklook/review-19.1 #10
• Adds detailed configuration for some lya_forest mocks.
• Backups of metadata directory are now supported.
• General update to configuration for compatibility with hpsspy/0.5.0.

I'm still doing tests on this, don't merge yet.

Items for discussion:

• While running tests, I've found some data sets that have files that have changed subsequent to backup. What policy should we apply to these?

[weaverba137]

@sbailey and I discussed this in person, and this is ready to merge. We still need to do the work of cleaning up problematic backups, but that is more of a sociological than a technical challenge.

In the cases of data that has appeared in areas that are already backed up, we need to look at these on a case-by case basis.