Z-score calculation in NERO mod

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Purpose of code changes on this branch:

When reviewing my code changes, please focus on:
Is the Z-Score being calculated properly

After the review, I'll merge this branch into:
/trunk

One of the reasons that Explore/Exploit isn't working correctly right now could 
be that the Z-Score is broken, we should look into this and make sure that it's 
working right.

Check Revision 275 for the last change to the code in 
/mods/NERO/NeroEnvironment.py

Original issue reported on code.google.com by AdamDz...@gmail.com on 8 Jul 2010 at 8:12

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Original comment by ikarpov on 13 Jul 2010 at 6:18

• Changed title: Z-score calculation in NERO mod
• Changed state: Accepted

[GoogleCodeExporter]

The explore/exploit calculation was fixed (i.e. fitness should not be 
re-calculated for exploiting individuals).

Original comment by ikarpov on 18 Aug 2010 at 1:30

• Changed state: Fixed

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Original comment by ikarpov on 24 Aug 2010 at 7:08

• Changed state: Verified