Potentially add and replace items

[martinbruckner]

add items:
2600 Brans

replace items:
replace "2805 Rice (Milled Equivalent)" with
2804 Rice (Paddy Equivalent)

replace "2556 Groundnuts (Shelled Eq)" with
2820 Groundnuts (in Shell Eq)

split items:
split "2848 Milk – Excluding Butter" into
2738 Milk, Whole
2739 Milk, Skimmed
2741 Cheese
2742 Whey
2743 Cream