Generate the new ammo brands randomly.

Weights now being:

Flame 3 Frost 3 Poiso 2 Penet 1 Reapi 1 Silve 1 Steel 1 Dispe 1 Explo 2

Also gave all the new brands a shopping price multiplier - *30, same as curare.

Signed-off-by: Eino Keskitalo <evktalo@users.sourceforge.net>

Created by  Eino Keskitalo  on October 29, 2009
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