Rgrow

- Python tests.
- Mismatch calculations for aTAM.
- Add several convenience functions to Python API.
- Improve documentation.

Version bump to fix some release automation problems.

The version number for Rust has been increased to give consistent version numbering for both Rust and Python.

- Combined the pyrgrow and rgrow repositories, to ease development and ensure version matching.
- Initial support for mid-simulation system parameter changes.
- RateStore multi-update optimizations.
- Significant refactoring of Python API, and more documentation.
- Calculation of mismatches and mismatch locations.
- Display improvements, with mismatches shown at higher display scales, and dynamic scaling.
- Parallel evolution improvements.
- Make UI no longer default for Python.

- Type improvements.
- Optimizations.
- thread_rng instead of SmallRng (easier code, no major performance change)
- Tiles as u32.
- Initial cffi interface.

- Improved UI.
- Improved errors.
- Improved evolve bounds specifications.
- Partially merged some Python interface items into this crate.
- Improved xgrow format support.
- Added tests, including the xgrow format.
- Included xgrow example files, and tested all of them.
- Other things I've probably forgotten.

- First released version.
- New kTAM model, supporting duples and changes to the system.
- New aTAM model, based on the new kTAM model.
- Simulation trait, allowing model-agnostic code.
- TileSet objects, allowing parsing of tileset inputs.