FONLLparts and n3lo_cf_variation

Adding 2 new keys to the theory template: FONLLparts and n3lo_cf_variation

polarized toy

• adds the implementation of the toy polarized PDF from https://arxiv.org/pdf/hep-ph/0511119.pdf (4.57)
• allows for Python3.11

alphaem_running and n3lo_ad_variation

• Add n3lo_ad_variation to theory template to enable N3LO anomalous dimension variations
• Add alphaem_running to theory template to enable alpha em running and removal of Qedref

SQL ORM

Switch database to SQL (in particular SQLite), make a proper ORM with SQLalchemy

Initial release

• to get a Zenodo DOI