Setlevel is not supported on npcserver because
its an old bad command (from the times when commands
could only have 1 parameter
) Without setting the
x/y position its not very useful.
Client-side warping is not allowed on upgraded
servers, you can only warp to levels where there
is a link to in the current level, or trigger some
server-side npc which then warps you. This
is for making it impossible to enter/leave levels
using some cheating program.