Added
- Nested bar charts by setting `nested_x=True` in `barplot()`.
- SeqSummary ability to read precomputed fastcat histogram data.
- Upgraded sample card functionality.
Fixed
- Regression causing empty line or scatter plots when no `hue` variable was provided.
- `lineplot()` and `scatterplot()` not handling the `palette` argument correctly.
- Mixed `start_time` offset bug in SeqSummary.