```
/home/msalinas/Documents/standalone-installations/cifParsers/libcifpp/src/pdb/cif2pdb.cpp: In function ‘std::tuple<int, int> cif::pdb::WriteCoordinatesForModel(std::ostream&, const cif::datablock&, const std::map<std::__cxx11::basic_string<char>, std::tuple<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >&, std::set<std::__cxx11::basic_string<char> >&, int)’:
/home/msalinas/Documents/standalone-installations/cifParsers/libcifpp/src/pdb/cif2pdb.cpp:3362:15: warning: unused variable ‘pdbx_nonpoly_scheme’ [-Wunused-variable]
 3362 |         auto &pdbx_nonpoly_scheme = db["pdbx_nonpoly_scheme"];
      |         
```
This warning appeared while compiling the library. The use of that variable below has been commented, so I think it's appropiate to do the same thing with the unused variable.

Installation commands in the readme cause an error when running last command `cmake --install .` because of the lack of sudo privileges.
The following commands don't require sudo to run successfully and install the library.

PDB writing changed for auth_seq_num
version bump

version bump