Avoid the centralized store

[wlandau]

Use qs on individual targets

[wlandau]

Should live in targets/data inside the project.

[wlandau]

I am stuck on how to deal with formats. Should we use file extensions to indicate the format? With extensions, we risk saving duplicate files, and we need to specify the format just to read the object. This is what is in 334e3f1, but it is not ideal because it breaks the data abstraction we want. The alternative is to save the target with no indication about the format, but that leaves us wondering what format to use when we go to read the target.

[wlandau]

Metadata should have the format. For now, let's use the _data suffix to indicate methods that only deal with the data values. In practice, we will setting values will be non-blocking and threadsafe, while metadata manipulation will always be a blocking operation because the metadata will be centralized (in an RSQLite database?).

[wlandau]

Sketched out the basics. Need #5 next.

[wlandau]

Avoid the centralized data store. Use metadata as the centralized class.