RS485/LogisticsPipes — pull request #335 by ArtForz (2012-12-31 23:53:30+00:00)
Title: Performance improvement: don't use invutil for internal filter invs

Add internal cached map to SimpleInventory.
Add helper functions to SimpleInventory so we don't need InventoryUtil for filter invs.
Don't instantiate InventoryUtil directly, always use the factory.