System.EnumContents doesn't specify categories in it's answer list

[rgammans]

Without full object id's in the contents list we
cannot find the relavent objects at all.

>>> game = ctx.OpenPackFile("examples/test1.mmpack")
>>> list(game.EnumContents())
['1', '2']
>>> list(game.EnumCategories())
['Items']
>>> list(game.EnumObjects("Items"))
['1', '2']
>>> game.NewCategory("Characters")
>>> game.NewObject("Characters")
Characters:1
>>> list(game.EnumCategories())
['Items', 'Characters']
>>> list(game.EnumContents())
['1', '2', '1']

Here we have show that multiple categories are listed but we can tell except from out history which category the '2' object comes from.

[rgammans]

Fixed by [bad66bb23384]