pica

BUR #51629 has been approved by @evazion.

create alias pica -> eating_non-food

good tag idea, but probably shouldn't be named after a semi-obscure real-life disorder, both for searchability reasons and because something something twys.

The bulk update request #51629 (forum #402296) has been approved by @evazion.

Currently half the tag is people chewing on hair, which I disagree with. There's a difference between actually eating rocks and crayons and chewing on someone's hair.