For 1.4.1.
Fixes:
*unique metal bars now produces correctly.
*"remove netherwood bark" produce proper seeds. (i have no idea how to make netherwood itself usable as leather)
*"boil leather in oil" correctly leaves oil in container with 50% chance. - however I don't know how to make it not to use already boiled leather.
*"press oil from pig tails" now leave seeds.