WIP: trying to get code coverage working

Does not yet work, xdebug seems to be installed ok, am using codeception/c3 for the remote part, it does something when you run the tests with ./scripts/test --coverage-html

... and it collects some kind of remote stuff into: tests/_output. BUT it is empty. I think there are some errors.

Actually I think the error is my nginx/php config isn't quite right, I can never get anything from the c3 paths other than the foodsharing website. /index.php/c3/... type paths.