Changes in version 0.0.0.9000                      

  - Added native source-population ancestry-interval extraction with
    explicit unresolved-lineage handling.
  - Added population and individual tables plus exact raw metadata and
    schema access.
  - Expanded the deterministic example to exercise recombining ancestry
    sources.
  - Added a pkgdown site and R-universe distribution metadata.
  - Added an initial native, Python-free binding to the bundled tskit C
    API.
  - Added tree-sequence loading, writing, summaries, node and edge
    access, sample IDs, tree intervals, and deterministic in-memory
    example data.