Changed getSourceId to distinct names

This way one class can be both plant/harvest for a single crop; makes
things easier on some modmakers
Weather Collector doesn't draw power if full
Fix NPE when enchanting items that can't be
DSU is smarter about setStoredItemCount
Merge branch 'master' of https://github.com/powercrystals/MineFactoryReloaded
math fix for setStoredItemCount
obfuscated name