What's Changed
* Fix issue with polars 0.20.23
* Add --notimeclamp option to plot spec --frompackets
* Use ExponentLabelFormatter for light curves
* Switch pyzstd to zstandard to match pandas dependency
* Add --vpkt_match_emission_exclusion_to_opac and stack vspec timesteps by lukeshingles in https://github.com/artis-mcrt/artistools/pull/172
**Full Changelog**: https://github.com/artis-mcrt/artistools/compare/v2024.04.23...v2024.04.29