Covers the final case where having the reconcile window open and
auto-completing a transaction then deleting the transaction before
committing it leaves the transaction in the reconcile window.
We need to signal that the account is modified even if it isn't
because that's what the reconcile window is watching.
The problem with take 1 was that the duplicate split uses the same lot
and account pointers without adding itself to those lists, causing
checks in unit tests to fail.
This reverts commit 4dbf803041.
The use-after free errors are caused by the compiler reordering the
steps in xaccSplitFree and Transaction's do_destroy. Unfortunately the
corrections here caused trouble in other places, leading to test failures.
