enable an appveyor_tuning branch to build
enable an appveyor_tuning branch to build

rvianello/rdkit,jandom/rdkit,rdkit/rdkit,ptosco/rdkit,adalke/rdkit,greglandrum/rdkit,greglandrum/rdkit,bp-kelley/rdkit,adalke/rdkit,ptosco/rdkit,jandom/rdkit,bp-kelley/rdkit,jandom/rdkit,ptosco/rdkit,jandom/rdkit,rvianello/rdkit,adalke/rdkit,greglandrum/rdkit,greglandrum/rdkit,greglandrum/rdkit,bp-kelley/rdkit,bp-kelley/rdkit,rvianello/rdkit,greglandrum/rdkit,adalke/rdkit,bp-kelley/rdkit,jandom/rdkit,rdkit/rdkit,jandom/rdkit,jandom/rdkit,adalke/rdkit,bp-kelley/rdkit,ptosco/rdkit,ptosco/rdkit,bp-kelley/rdkit,rdkit/rdkit,ptosco/rdkit,ptosco/rdkit,greglandrum/rdkit,rvianello/rdkit,rdkit/rdkit,rvianello/rdkit,adalke/rdkit,ptosco/rdkit,jandom/rdkit,rdkit/rdkit,adalke/rdkit,greglandrum/rdkit,rdkit/rdkit,rvianello/rdkit,adalke/rdkit,bp-kelley/rdkit,rdkit/rdkit,rvianello/rdkit,rdkit/rdkit,rvianello/rdkit