ba_gua -> bagua

BUR #4713 has been approved by @nonamethanks.

rename bagua -> bagua_zhang

Wikipedia lists it as one word, although i see it used both with and without space.

There's an artist under the consequent so that needs to be fixed first.

BUR #4714 has been approved by @evazion.

create alias ba_gua -> bagua

See above

The bulk update request #4713 (forum #180801) has been approved by @nonamethanks.

Changed it from bagua_(artist) to bagua_zhang, since that's the pinyin reading of his display name.

The bulk update request #4714 (forum #180803) has been approved by @evazion.