Unconfuseify tag nick/tag listing behavior

[jstultz]

.tag list foo should list the tags for foo (especially considering that .tag list lists tags) .tag foo should list the things tagged with tag foo

Also don't call the function that doesn't exist anymore.

[aaronmrice]

I'm in total opposition to this patch. Not only is the author only somewhat cool, but I'm used to the behavior as it is.

[ednos]

Maybe you should update the patch to include a legacy tag command, .ltag or .gob, that conforms to the old behavior.

[tjsnyder]

I could certainly be swayed one way or another with this pull request. I think we are going to want to increase the version number and release proper documentation for those upgrading though.

[jstultz]

Superceded by better change to interface that's been made (.tag .tags .tagged)

[rmmh]

Thanks for driving the discontentment with terrible tags syntax until a fix was found