editor v2 and replace

Hi Greg,

IMHO it would be nice to have an svn_editor_cb_replace_t in editor v2.

I'm currently faced with a merge that replaces an item. The item is first
deleted and later added in a given merge range. Thus, merge first calls
file_deleted() and then file_added() (current "diff editor" callbacks).

That's a little awkward for

- displaying "R" instead of two lines "D" and "A" (diff --summarize?)

- making sense of a tree conflict. I'm currently fixing exactly this case,
where a merge replaces a file on top of a locally modified file. The current
code tries to create two tree-conflicts on the same item and fails.

It would need generic arguments for mixed node kinds...
If you agree, I'll be glad to add that, so you can review it to shreds ;)

~Neels

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