#133 Power formula flaws

[Markus Armbruster]

* uw are irrelevant

* Processing dust into bars lowers power

* Making guns and shells lowers power

* Building units normally lowers power. All planes
contribute the same power, regardless of type or tech
level. Power from ships and land units depends on `cm
contents' only, not on money.

[Markus Armbruster]

Fixed in commit ea5c8a6, 5635fc2, e8451c7, v4.4.0.