Revised wielded weapon tiles.

Absent: launchers, giant clubs, demon weapons, scythes, hammers, whips, clubs.
Clean up some definitions and ruffle a few feathers in a vault

For gammafunk_depths_water_palace, fix up some KMONS and correct some
no_rtele_into. Also give a small chance for a single caustic shrike in
the two highest-tier monster placements.
Reduce confuse duration in a few places (crate)

The older confusion durations made no sense and clearly assumed the
player would just use !curing. Orc wizards could confuse players for
over 35 turns on a lucky roll, and some spell miscast effects could
confuse the player for 60 turns.

The new standard is 5-7 turns for monster spells, gods confusing the
player, and miscast effects.
Strip an underscore.
Don't make books of Wizardry and Power artificially common.

This particular bit of code seems to date back in some version to before
DCSS. We're much more sophisticated in terms of our spells and books
these days.
Give the Plane Papyrus its new name in book-data.h.
Remove the book of Wizardry.

It's long since lost any semblance of thematic connectivity and has
instead become a dumping ground for spells we can't find any other good
books for, not to mention making some extremely powerful spells possibly
too common.

The only spell there not in any other book, Spellforged Servitor, is now
in the book of Power (which is no longer artificially common as of the
last commit). Every other spell is in exactly one other book; if you're
hungry for one of those spells to be common again, you can always
worship Sif Muna.
Refactor some armour code

This was sitting around in the shp branch, but there's no reason
it can't be merged in now.