Fix a range assert (9284)

off-by-one...
Adjust Singularity pull damage.

Having HD factor into this twice caused the damage to be extremely low
on the low end of the power scale, so now the size of a damage dice is
fixed at 6.
Possibly fix ?/G (9280)
Don't count Delayed Fireball as three-school.

And mark it as a utility spell.
Colour AC/SH when corpse armoured in webtiles
Don't call orbs of destruction "creatures" (9285)
Quotesgiving (9266, 9270)
Fix quoting
Revert "Gozag: only duplicate one of a stack of items."

Being able to duplicate multiple items makes the ability
much more useful; in particular, it presents the player with
a choice of using it to duplicate early-game consumables, or
wait to see if later, more valuable items show up.

TODO: figure out how to reword the description of the ability
in ^.

This reverts commit fe8694ce61bd93657398bfb710cbb022ca7a0c9d.
Spell (chequers)