evolve: store the old other divergent node after relocation in evolvestate When the content-divergent changes are on different parents and we relocate of the node to the parent of another one, we get a new other-divergent node. We still need to store the older other-divergent in evolvestate so that we can use that information.

test-drop.t
test-inhibit.t
test-simple4server.t
tests/test-simple4server-bundle2.t