[1.0.0.129] Siege Tower affects bombarding

[Thibaulthc]

I've had several problems with my Bombards and Artillery lately; sometimes I can shoot just after moving (without the Expert Crew promotion) and last one is that a Siege Tower adjacent to a city made my artillery doing as much dage to the wall as to the city itselfs. So double damages! I could clearly see the "planned damages" graph from my bombard unit to the city changes wheter I move the Siege Tower next to the city or not.
I was playing with MOAR units but that shouldnt affect artillery not siege tower

TLDR: Siege Tower allows bombarding units to double damages

Also, Battering Ram and Siege Tower effects are cumulative, is that planned ?