Fix curl fallback for downloading files (#1904)
Fix curl fallback for downloading files (#1904)

The curl file download fallback option was not saving files as
the correct filename. Instead, it used the -O option, which
saved the files using the remote's name for the file! This
was problematic for files downloaded using specification of git
sha.
rdkit/rdkit,ptosco/rdkit,ptosco/rdkit,rdkit/rdkit,bp-kelley/rdkit,bp-kelley/rdkit,greglandrum/rdkit,greglandrum/rdkit,rdkit/rdkit,ptosco/rdkit,bp-kelley/rdkit,greglandrum/rdkit,ptosco/rdkit,greglandrum/rdkit,rdkit/rdkit,bp-kelley/rdkit,rdkit/rdkit,rdkit/rdkit,rdkit/rdkit,bp-kelley/rdkit,bp-kelley/rdkit,ptosco/rdkit,rdkit/rdkit,bp-kelley/rdkit,greglandrum/rdkit,ptosco/rdkit,ptosco/rdkit,greglandrum/rdkit,greglandrum/rdkit,bp-kelley/rdkit,greglandrum/rdkit,ptosco/rdkit