CAA in internetstandard checks

The internet standards check at internet.nl has added a CAA check a while ago. Although the data for CAA has been in ShadowTrackr for years, it was still lacking on the internet standards overview and report. That is fixed now.

The current update also introduced the option to make a proper PDF export of the $dns_dependency_report. While this sounds like a small step, it's actually quite a thing. The code behind this opens the door to exporting all sorts of fancy graphs to PDFs.