源代码编译安装OpenBabel3

Install OpenBabel3

```

git clone https://github.com/openbabel/openbabel.git

cd openbabel

git checkout openbabel-3-1-1

mkdir build

cd build

cmake -DWITH_MAEPARSER=OFF -DWITH_COORDGEN=OFF -DPYTHON_BINDINGS=ON -DRUN_SWIG=ON ..

make

make install

```