Repository and data structure

- What repositories should we have? Suggestions so far include:
- Sequence data, non-sequence-data
- One per family (sequence data), one for periodically updated data (blast DBs, kraken, snpeff), one for everything else
- One per genome (CVMFS technical limitations?)
- What should the structure inside the repositories be? Suggestions so far include:
- NCBI taxon
- By indexer/DM

Start with issue #9 and compare its proposed repository splits with the suggested structures inside repositories. No implementation files or tests are named; the work is complete only after the repository organization and internal layout have been agreed and documented.

Written by the indexing model from the issue text.