tag_get_tags() is inaccurately named

tag_get_tags is actually returning tag instances from the tag_instance table rather than that tag table. It should be renamed tag_get_tag_instances() then, if necessary, another function could be added that actually returns tags.

Also, the function tag_get_correlated() needs to be checked. Most likely it be returning the same columns as tag_get_tags() NOT tag_get_tag_instances().