Internally, commands are now stored a bit differently: some commands
which were at the end of a turn (like the players rack in duplicate
mode) are now at the beginning. But from a user point of view, there is
no visible difference, except some details in training mode (and the new
behaviour is arguably better :)).
Only (known) problem: after loading a game saved before this commit,
navigating in the game history may be less nice (in particular, racks
may not be fully restored).
