Remove seed values - they don't work

Everything with a seed value specified will use the same seed, even if
the value is different for each. This appears to be a bug with the COG
mod.
I guess it will be ok to not have continuous ore veins through different
stone types. It doesn't really make sense that ores continue through
different stone types anyways... we'll see.
Make copper more common in jungles and none in deserts
Don't allow ores placed in specific stone bases to replace smooth stone

For inherited ore distributions, disable spawning in smooth stone.