`simulate` method for `DesignOrdinal`

[danielinteractive]

simulate for Design with DataOrdinal / new DesignOrdinal still needs to be implemented

[danielinteractive]

@PuzzledFace-Astellas we don't have it yet, correct? just such that I don't miss anything

[PuzzledFace-Astellas]

Correct. It's on my (ever-growing) to do list. Let me know if this becomes a problem.

[danielinteractive]

Thanks @PuzzledFace-Astellas , not a problem, but if we want to get this in for the end of November CRAN release you might want to help me with this :-) otherwise we will need to push it to the next CRAN release