Redo mining

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Proposition for redoing mining calculus.

Before implementing orbital habitation, concept of mining has to be redesigned. 
Currently miner efficiency is 1 + planet's ore abundance multiplied by industry 
worker efficiency. New model should resemble more to traditional model where 
miner efficiency is proportional to ore abundance on planet and unaffected by 
industry efficiency.

Also, habitation and building maintenance should have special treatment, like 
using less ore.

Original issue reported on code.google.com by subchann...@gmail.com on 9 Mar 2011 at 11:20

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Original comment by subchann...@gmail.com on 27 Mar 2011 at 10:13

• Changed state: Started

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Original comment by subchann...@gmail.com on 3 Apr 2011 at 8:44

• Changed state: Done