[Kwant] Re: tkwant-green function

[thomas . kloss]

As answered previously, the GreenFunction functionality has not yet been 
released as part of a stable Tkwant version, 
so its not possible yet to install it via conda. 
To make above code working you will need to clone the development version 
(master branch) of Tkwant and follow the installation from source steps from 
the documentation.
Regards, Thomas