Znuny and ((OTRS)) Community Edition

I had the same problem with the templates path. I fixed it and sent a PR (https://github.com/OTRS/doc-developer/pull/15). Hopefully the next person to do the tutorial doesn't have to deal with that. I didn't change the AgentHelloWorld.pm file, though, and it worked anyway. But maybe that's important...

I used Modern Perl, by chromatic (http://onyxneon.com/books/modern_perl/). The electronic versions can be read for free. It's really good if you are already an experienced developer.