quick and dirty ffd6 skill fixes

1. Remove the following skills: Acting, Inquiry, Language, Scavenge, Swimming

They are already covered by the following:
Acting - Perform, Negotiation
Inquiry - Lore, Negotiation
Scavenge - Nature, Systems, Thievery
Swimming - Athletics

Language is replaced by deciding what kind of languages each character logically knows, such as Theta knowing Terran without needing a Language skill.

2. Raise skill point totals as if everyone had started with the highest out of skill point totals offered by starting classes - in this case, White Mage with its 22 points.

This works out to:
Ammy: +2 skill points
Lenore: +4 skill points
Nat: no change
Theta: +4 skill points

3. Offer each character one or two "signature skills" which act as if their skill cap were 2 higher