Do we need both the tags [tag:zip] and [tag:unzip]?

 - Or more generic: should we clean the un-$compress tags to $compress?
 - Our should we even consolidate some of these tags into [tag:compression]?

Inspired by [this similar post](https://meta.superuser.com/questions/8677/do-unrar-and-unzip-deserve-their-own-tags) on [SU] and seeing a few posts with the [tag unzip](http://serverfault.com/questions/tagged/unzip) (20 uses).