Revert "Prevent Tornado from moving monsters through solid features."

That commit broke assumptions that if an actor can be swept from A to B and
from B to C, he can be swept from A to C as well.  This caused crashes on
some permutations; also, longer turns (a slowed naga of Chei) tended to
pile actors up on one side of an obstacle.

For now, I made grates airtight so the main problem that commit was supposed
to fix is papered over.  Trees are not airtight which allows people to get
swept through them; this is not good but has nearly no practical
implications.

This reverts commit 6f473416a0b6cffe0759a792ac536c739c4a395f.
Make Xom stair repel duration use aut instead of player turns.

This also shortens it to a more reasonable duration. It looks like this was
accidentally messed up in e18e5ec6.
Don't allow casting Ozo's armour while ring of flames is active

Condensation shield already can't be cast with RoF up.
Remove invisibility from a statue
Buff blood acquirement

In the extremely unlikely event that anyone ever acquires food as a
vampire, it should at least provide enough to get from Bloodless up
to Full or so.
Stamp out blessed toes.

While some religions have a fetish with playing with body parts, it's only
the evil side who ever animates them.
Simplify.
Make monsters value rN only if it's useful.

They wanted it only if useless...
Make demonspawn MH_NATURAL.

They're humans with just a drop of demonic blood, so only good gods should
care.  Holy items all work by a blessing of TSO, so there's no change there.

The holiness gave them a bunch of surprising resists.  Player demonspawn
were immune to unresistible (only) poison and perhaps some other effects as
well, monster demonspawns (nearly unused) were immune to all of necromancy,
rotting, torment, fear; couldn't go berserk, etc.

Also, don't waste Vamp Draining when it's known to not work.
Don't let Kirke randomly turn monsters on her side into pigs.

She could do it sometimes if they had less HD than a hog.  Perhaps a
somewhat smart thing to do, yet anti-thematic and quite confusing.
(Introduced in 4dc3033.)
Indentation fixes.
Remove (now unused) monstrous mimics on next save bump.

They could spawn only in alternate Zot:5 vaults that included an Orb mimic;
these are gone now.  Monstrous feature mimics were never a thing.

As monstrous mimics mimicked ravenous mimics when it comes to tiles and
webtile encoding, supporting them in old saves is hardly more complex than
using AXED_MON().
Purge a remnant of ~ traps.
Fix false annotations being created in the Abyss.
Drop a reference to blessed toes from the docs (ChrisOelmueller)
Webtiles: fixes for mana minibar

- draw mana minibar with correct height
- display mana minibar when mana is depleted
- only display mana minibar when character can have mana

This makes appearance of the minibars more consistent with the Tiles version.
Webtiles: Fix the player position not being sent at startup, causing a tiny minibar bug.
Webtiles: A small minibar refactoring.
Fix molten and icy blue scales always giving just 1 AC (Vizer).
Fix computation of count in dgn_replace_random

This allows dgn_replace_random to be used on a single-square-wide
or -tall rectangle.