What's Changed
* Docs: Update axis of thermal expansion plot by jan-janssen in https://github.com/pyiron/atomistics/pull/120
* Quasiharmonic Approximation: Use the same size of supercell for both the energy volume curve and the phonon calculation by jan-janssen in https://github.com/pyiron/atomistics/pull/119
* Define quantities only once by jan-janssen in https://github.com/pyiron/atomistics/pull/118
* Merge main by jan-janssen in https://github.com/pyiron/atomistics/pull/122
* Bump pandas from 2.1.3 to 2.1.4 by dependabot in https://github.com/pyiron/atomistics/pull/125
* Bump spglib from 2.1.0 to 2.2.0 by dependabot in https://github.com/pyiron/atomistics/pull/126
* Refactor output classes by liamhuber in https://github.com/pyiron/atomistics/pull/127
* Run select tests on all PRs, not just those to main by liamhuber in https://github.com/pyiron/atomistics/pull/128
* Separate module for output classes by jan-janssen in https://github.com/pyiron/atomistics/pull/123
* With a dataclass by liamhuber in https://github.com/pyiron/atomistics/pull/121
**Full Changelog**: https://github.com/pyiron/atomistics/compare/atomistics-0.1.14...atomistics-0.1.15