MQCPack version 22.6.1

Code infrastructure changes

• Continuous integration now uses GitHub actions
• Interface to gauopen API updated
• Improved versioning subroutines

Electronic structure objects enhancements

• Extended two electron integrals, including enhanced use of spin symmetry, general molecular spin orbitals, and different bra and ket orbitals
• Routines for building truncated configuration interaction determinant expansions
• <S^2> matrix elements and One-particle density matrix for post-SCF method

Linear algebra objects

• Enhancement to ‘algebra2’ types that are general and so do not require rank to be specified
• Additional features in ‘algebra’ types

20.7: Merge pull request #75 from thompsonresearchgroup/master

Update to travisCi script (#96). This merge fixes issue #72