Proper tracking of file-level operations: rename, directories, merges

[Stephen J. Turnbull]

Barry Warsaw writes:

 > Refactoring is the most important one that comes to mind.  Say I
 > have a file that I want to split into two files.  Ideally, I'd
 > `bzr cp foo bar` and then do the respective edits.

More ideally, you'd do the respective edits then `bzr cp --after foo bar'.

This is one case where --after/inferring the copy really makes more
sense, I think.  Of course, here inferring is hard.