add notes about having native metal nugget drops from conglomerate
introduce specific support for BoP shield biome
avoid generating ocean geology in any non-ocean water biomes
replace stone based on ore dictionary
granite replaces grass in BoP dome biomes
stone is now marked as GenMineableReplaceable
fix some ore dict keys
sketch for adding chance drops
refactor configuration to support configurable harvest levels and
stone tool damage values, as functions of block strength; also add
shapless (cobble)stone => vanilla (cobble)stone recipes for mods that
do not define recipes with the ore dictionary