[Kwant] Re: TKwant Installation procedure

[thomas . kloss]

Dear Gabriel,
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