Object spawning on coffin & Higher wizard hat graphics

[Nussbaum]

Reporting two separate bugs. Other is minor; Human/Higher doesn't get graphics for wizard hats. Regular "linen wizard hat" is ok, at least, but at least Hat of Arcane Understanding and possibly other hats of same tier have no graphics. On Cornac, I think the hat can be seen, even though both human races have basically similar paperdolls (with different hair color).

Another one is possibly caused by Meteoric Crash prodigy. It may cause objects to spawn on tiles that are undiggable (when a monster dies and drops the items), special tiles such as coffin tiles; possibly the meteor temporarily destroys also these coffin tiles and turns them into lava causing this. The coffin tiles are not technically "undiggable" walls, nor "diggable" walls, yet they are tiles that aren't diggable.

I have ToME 1.3.1 / Linux 32-bit.