Allow Prime's to delete and/or close their threads

We aren't trying to copy HF are we? I like the part of closing thread just not "junking" them.

Omfg. Just because we take some features from the usergroups of HF doesn't mean we are "copying"
Why the fuck must everyone automatically assume "OMG STOP COPYING HF IF YOU ADD ANYTHING SLIGHTLY RELATED TO SOMETHING ON HF YOU ARE A BIG COPYCAT" God damn.

Anyways, on-topic, I'm glad everyone agrees with the closing part. However, yes, the deleting can be abused, so I agree that we do what Outside Nanner suggested: 1 post deletion per 24 hours.