Setting up PHP CodeSniffer with NetBeans

I’m setting up phpMD / CodeSniffer into my NetBeans 7.3 on Xubuntu 12.10 again, so that I don’t have to look all the stuff up again. First I install the plugin. Then it complains that the underlying stuff isn’t properly configured. (Of course it isn’t as I haven’t installed anything else yet.) Let’s start with …