Add 6-311G** basis set to the library (!120) · Merge requests · Molcas / OpenMolcas · GitLab

Jellby requested to merge 6-311Gpp into master Feb 18, 2019

6-311G** basis set copied and adapted from https://bse.pnl.gov/bse/portal

Documentation updated or not needed.
Test created or not needed.
Attribution in source files and CONTRIBUTORS.md updated if necessary.