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jCopperDrill

Did it never bothered you that you could unlock iron drills, but apparently you had to keep mining copper with a pickaxe forever ? Not anymore !
Add the copper drill (1-2-3) to the game. Unlock through the same research than iron drills.
They are similar to iron drills (power, resources produced, appearance....), except for the fact that they need copper in the ground, and produce raw copper.

Also edited the description text for the iron drills, to reflect the differences with the copper drills.