Animal bag implications

BUR #4667 has been approved by @evazion.

create implication shark_bag -> animal_bag
create implication bunny_bag -> animal_bag
create implication bear_bag -> animal_bag
create implication cat_bag -> animal_bag

Self explanatory, also there are lots of [animal]_bag tags that aren't tagged animal bag and vice-versa

Not sure we want implications on tags with only 15 posts. cat bag is the only one with more than a hundred posts, so +1 for that one.

The bulk update request #4667 (forum #180490) has been approved by @evazion.