Multi-hit moves are calculated wrongly when damage-reducing berries are involved

[Dangelman]

This bug still seems to not have been fixed. #348

When calculating super-effective damage reduced by Berry (eg. Rindo Berry), the calculator considers the entire output of multi-hit moves halved, while in reality only the first shot is.
So if you have Rindo Berry and you're hit by a skill-link Bullet Seed that suppose deals around 150% damage normally, the calculator tells you you'll receive 75% damage instead of the correct 135%.

On a similar note, it'd be nice to have a Substitute switch as feature for calculating multi-hit moves.