New features and improvements
- amplicon simulation with `--sequence_type amplicon` (and optionally `--readcount`)
- new and updated error models (including NextSeq, and MiSeq models with different quality thresholds)
- improved memory usage and performance
Bug fixes
- `iss` now always simulates the correct number of reads
- fix incorrect insert size distributions in existing models
Other
- switch to pytest
- linting and formatting