Supaplex DS: Cancelled

I switched Supaplex DS from "Halted" to "Cancelled".

For one reason is that the current code of Supaplex DS is old and buggy, plus it uses PAlib, so any further work will require a complete rewrite (I do not plan to ever use PAlib again, although it is a very good library [for beginners]). Second, I believe Supaplex was listed as playable under DSx86, so playing the original on NDS is possible.