Formally identify tin and magic whistles on use

The messages given when they're applied unambiguously identify them.
Formal ID enchant armor scrolls used on dragon scales
Allow teleport control to cancel teleports

Pressing escape at the position picker allows you to simply not teleport
anywhere, like NetHack.  Unlike NetHack, doing so for a deliberate
teleport (using Ctrl-T) will not use a turn or cost hunger.
Show message after being teleported w/out telecontrol

So if you step in a teleport trap you'll now get the message "Your
surroudings suddenly seem different."
Stop multi-turn actions when levitation ends

Bug reported against and fixed by NetHack4.