Checkpoint changes: clean up APIs, separate out MVCC and naming strategies.

Matthew Swift

08.37.2013 d89aacc0431eab3dce367e8fe9575eb8f83aa535

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user-friendly-name=Sk\u0142adnia Atrybut\u00f3w
user-friendly-plural-name=Sk\u0142adnie Atrybut\u00f3w