Refs #339 Readonly fields get displayed incorrectly in History view

Instead of passing the Version parameters as initial, override them in the object itself
Ok, so I've just pushed a new commit which tries to apply the same strategy with inlines. It's working so far in my tests. The part that sets a fake queryset is a bit hackish, but not terribly more so than what it's replacing. Please review and let me know what you think!