Adcc

- Support newer GCC compilers (e.g., on Conda) 165

- Fix bug with transition moments of antisymmetric/asymmetric operators (158)

Changelog

- Bug fix with `pyscf` import when `cppe` is not installed on the system 145

What's changed
- Drop python 3.6 (134)
- Pandas and matplotlib are optional dependencies (141)
- Remove conda release scripts (now on conda-forge) and refactor python CI (143)

**Full Changelog**: https://github.com/adc-connect/adcc/compare/v0.15.9...v0.15.10

Changelog
- Support for Python 3.9 (114)
- OneParticleOperator on the python side (119)
- Various smaller fixes (114, 125)

**adccore version:** 0.14.4 -> integrated into libadcc

All components of adcc are now a fully open-source and released under a GNU GPL 3.0. We encourage everyone from the community to freely use, improve and contribute to adcc. Please get in touch with us ([New issue](https://github.com/adc-connect/adcc/issues/new), `developersadc-connect.org`) if you have a project in mind. We're happy to help.

Changelog
- Adccore is now integrated into libadcc (thus adccore is obsolete) (106)