Update Rulebook BV Mod for Base 10 from Old Base 5

Simple job check if the rulebook has any mentions of BV mod being set to only 1-5. If so update so that the following is the new scale:

BV BV mod

1 0.9
2 0.9
3 1
4 1
5 1.1
6 1.1
7 1.2
8 1.2
9 1.3
10 1.3