[MERGE] Handle empty list like non-empty list in iter_changes, revert

[Aaron Bentley]

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Hi all,

This patch updates Tree._iter_changes and revert to make their input
handling more regular.  Previously, they had treated the empty list
differently from all other lists-- selecting all files, instead of
selecting no files.  This behaviour is nice for processing commandline
input, but it doesn't make sense for an API.  Now None is used by both
to select all, and [] is used to select no files.

This patch updates Tree._iter_changes without deprecation, because it's
a private method.  It updates revert to accept None, but maintains
deprecated support for [].

Aaron
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