- [X] Convert weave's threads to crossbeam
- [X] Convert weave to be pull instead of push
- [ ] Add support for zstd compression
      This is both significantly faster and compresses better than
      gzip.

# Prototype of SQL version.

- [ ] Build a 'writer' that implements something like StoreWriter, but
  without using ascii encoding (to avoid parsing again), but writes
  actual nodes.
- [ ] Build up directories as they are assembled.
- [ ] Store attributes, possibly buffering them up to make the query
  more efficient.