Added a confirmation page before forum post deletion as per halcyon's request.

I think H13 has made a pretty good argument for tags at this point. I'll proceed with a hybrid tag field that automatically recognizes and removes # signs unless someone comes up with a big complaint. This should, I hope, help cut down on noise when performing a search.

...and if hashtags are really so evil, we can call them octothorpetags or poundtags or something.