Topic: Remove Implication: bisexual_sandwich -> sandwich_position

Wikis: bisexual_sandwich | sandwich_position | train_position

bisexual_sandwich currently implies sandwich_position.
As a result, many posts with the bisexual_sandwich tag are incorrectly tagged as sandwich_position, when they should be tagged train_position.
The main difference between sandwich_position and train_position is the direction that the bottom character is facing.

Updated by Zeorp