standing on head

BUR #8178 has been approved by @nonamethanks.

rename standing_on_head -> standing_on_another's_head

Avoiding confusion with headstand.

This should be a rename instead of a mass update.

There is no wiki page and I doubt an alias is needed. Isnt this what mass updates are for?

mass updates should only be used for moving sets of posts, not tags. If you're moving a tag to another you should always use alias or rename.

The bulk update request #8178 (forum #201836) has been approved by @nonamethanks.