#2174: Test "Multi Patch Scalar Wave Equation" example

Comment (by Roland Haas):

Please do upload the latest data to this location: https://bitbucket.org/einsteintoolkit/www/downloads/ (there is an add files button) then update the date on the website.

This way (depending on the compiler used of course) people trying out the gallery example can download the sample results and compare.

I believe the sample data tends to contain plot scripts etc as well, it would be great if the new downloads also contained all such extra material.