Removal Conflicts loop

[Jason Gunthorpe <jgg@gpu.srv.ualberta.ca>]

Okay, I just discovered there is another kind of loop that can arise.

Consider: 
  Package: A

  Package: B
  Version: 1
  Depends: A
  
  Package B:
  Version: 2
  Conflicts: A

Commands to order:
  Remove A
  Install B

What do you do? Remove A will fail because B depends on it, install B will
fail because it conflicts with A. And as with the perl loop removing B
will cause problems for B's dependants.

Jason