add cached-block verification to worksites on bounds adjusted.  add
basic tool-quality check to quarry for harvest-level.  add basic tool
quality/enchant check for power-use.  add quarry checking for enchanted
tool level for fortune-based drops.  add -very basic- fortune simulation
code for animal worksite. add fortune based drops to mushroom, reed,
crop, tree farms.  add basic fortune-simulation code to fish-farm for
enchanted tools upgrade.