Updated .module for 4.7

Issue Summary

Well, I updated the module to 4.7 to the best of my (somewhat limited) knowledge. But I stuck very closely to the tutorials and used the form converter, so there shouldn't be any security risks introduced by me... As for it working, well, it does. I didn't test it very thoroughly though, since I converted to CCK shortly after managing the update...

I'll try to get this into the CVS if I get my rights...

Until then, it's attached right here.