issue 3899 (copying conflict victims)

I've assigned issue 3899 "forbid wc-wc copy/move of conflict victims"
to myself, but I think it needs a little more discussion.

The basic idea is that the conflict data (including marker files) includes
references to "their" version from the repository, which would be invalid
anywhere else in the working copy.

In an issue comment, Philip says:

  Perhaps we should simply prohibit copies where a conflict exists?
  That would also solve another problem: actual-only node conflicts
  are not copied.

Along those lines, I propose to forbid copy or moving:

 1. any conflict victim (text, property, or tree)

 2. any directory containing conflicted children

 3. any child of a tree-conflicted directory

These apply to the move/copy source only. Resolving a tree conflict
may require copying or moving an item /into/ a conflicted tree.

Also, a property conflict on a directory should not prevent copying or
moving the directory's children.

Comments?

I have a simple solution for #1 above, and the beginning of a test.
I'll commit them if I get a +1.

Regards,
Steve

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