Adjusted mining level requirements

At least they don't all require iron anymore...  especially high-end
ores, like adamantium :|
Oh well, I tried

It just sets these back to this, so I guess we have to keep them like
this.  And setting the chance to 0 does nothing, apparently.
Added dense aluminum

Also the capitalization of the retroGenID seems to be enforced?  It kept
adding a second line with after restarting client.