Don't crash when a Dithite might summon zombies.

See for example:
 http://crawl.lantea.net/crawl/morgue/wvc/crash-wvc-20140910-111834.txt

This solution is kind of a hack, but as long as _downscale_zombie_attack
always strips off AF_FIRE (and orcs don't get AF_FIRE) it should work.
Be more careful with that dummy zombie.

Use a goblin rather than orc zombie because the latter might someday
have theological implications for Beogh.
Clean up some cloud code.

Including removing a function unused since 3e2eb95d2b, 4 months ago.
Make casting while starving more consistent with while silenced (#2272).

I took rwbarton's suggestion of giving a more() as well, so that more
keystrokes in, say, a macro get eaten by that instead of being
frameshifted.
Add a clumsy line to unseen horror description, hinting at bat movement.

The reasoning is that a new player can figure out she died to a monster
called "unseen horror", and then look it up in-game. Improve wording!
wizmode command to lose all gold
avoid "you see a gate leading out of here here"
make the player feel a bit safer

hopefully this will reduce some of the issues with glass walls without
making things particularly more dangerous (*4 is very conservative)
Remove a giant eyeball from a vault.

It didn't work well in this vault and giant eyeball isn't a standard Depths
monster nowadays anyway.
Add a vine stalker quote (rast)