GitLab

Adding initial models.

1. DataProduct(Type)
2. The "backbone" of the project. These models define where to find data products and how they relate to each other.
3. For example, fiphot files will be derived from astrometry and fits files on disk. We should be able to traverse those relationships.
4. Invocations
5. The "meat" of the project. Here we track how products are generated, by who, and with what environment. I think this is where the most thought will be needed and revising.
6. Environment
7. A mesh of tracked Libraries and Variables will make up Environments (as well as computer hostnames). Here we track a snapshot of an environment whenever an invocation is made in an effort to be able to replicate data.