Adding files for TiledArray based SCF and closed shell Hartree-Fock
Added compile check for OpneBabel2 ... on late Macs the package-managed versions get detected but don't compile
Fixed minor typo.
Added unit test for TiledBasisSet
Added TiledArray version of Closed shell Hartree Fock
Moved TiledArrayBasisSet into the mpqc::TA namespace.
Merge branch 'master' of https://github.com/ValeevGroup/mpqc into TiledArrayScf