[MERGE] versionedfile.py code cleanups

[Ian Clatworthy]

Aaron Bentley wrote:
> Ian Clatworthy wrote:
>> More minor improvements.
> 
> I'm sorry, but these improvements are too radical to be included. ;-)

As BB doesn't yet support "bb:too-radical" voting, I'll help out here by
actually providing some changes this time. ;-)

Ian C.
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