add undo/redo for operations propagated to complement view

When an operation on a protein or CDS view is propagated to its complement, there needs to be a corresponding undo/redo operation also propagated, to maintain coherence between undo/redo stacks for the two views.

Coherence is necessary because Jalview's undo/redo system only guarantees a consistent state if operations are reversed in the same sequence they were applied, but if one applies a a sort operation in one view, then a sort operation in the other view, it is possible to undo these operations in a different order since undo entries are only created in the view they were applied.