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I'll merge this myself eventually, so this PR is more of a heads-up and opportunity for anyone to comment, object, or tune.
The biomes-based mapgen creates the same amount of lava ores as the original nether mapgen, but it doesn't have the same issue of chunk emerge order causing lava ores in the overdraw regions to randomly get removed. This adjustment will hopefully balance that difference out a little. (see also paramat's comment about why too much lava isn't necessarily desireable, plus I'm also hoping to add a new region to the nether at some point with lava seas - so people can get their lava-pool fix that way)
Also makes glowstone stalactites a bit rarer.
Adjusting lava ore scarcity in the biomes-based mapgen doesn't cause forwards or backwards compatibilty issues with existing maps, likewise with schematic rarety like glowstone stalactites, so we can afford to fiddle and tune with the biomes-based mapgen.