I finally managed to add Flattr button to
Google Code projectpage for python-patch. The button, if clicked, leads to
the
Issues with Flattr - I couldn't find a way to set thing image.
Issues with Google Code - can't make more than one custom
gadget in one line - it inserts <h2> tag before each one and it
seems that this can't be helped.
The way to embed gadget is
here.
The gadget source itself is
here.
Comments - to add more buttons, like Twitter and Facebook,
as Google Code gadget in one line, you will need to wrap both
buttons into single Gadget.