Slightly adjust caustic bee spawn rates

Make it less likely for them to spawn in D and also change their
Depths distribution from SEMI to FLAT.
Increase the value of sacrifices which remove existing muts (rchandra)

If you have a good mutation and get a conflicting bad mutation (e.g.
you have robust and gain frail) and that bad mutation is innate, you
lose all levels of the good mutation and gain the bad mutation.

Thus, Ru gives you an extra 15 piety for each such mutation lost unless
it's a stat boost, in which case and extra 6 piety.
Add two quotes (#9107, #9111).
Move Orc/Elf/(Dwarf) to after Lair and its subbranches in ctrl-O (#9115).

Also moves Forest to next to Crypt.
Remove item colour state

Calculate it as-needed.

Divine weapon brands & weird corpses (with BLACK genus colour)
have colour stored in props; the rest do not.

"item_colour" is still needed (to initialize item.rnd and a few
other values); to provide a canonical check for whether it was
set, item.rnd's 0 is now reserved. Old items with rnd = 0 will be
re-randomized.
Don't colour randart jewellery lightblue (wheals)

Since that's the colour of un-id'd jewels!
Re-allow lightmagenta randart weapons/armour (|amethyst)

Accidentally broken in 0acbe5bd5bbd.
Require rng initialization for item validity

And display it in item descriptions when in wizmode.
Don't claim that "starvation awaits"

1131 games for * (lab recent): 902x mon, 167x beam, 18x quitting,
15x headbutt, 10x pois, 7x starvation, 4x disintegration,
3x cloud, 2x burning, 2x water, bounce
Don't randomize book colours every time you look at them
Don't crash when trying to save corpses
More item.rnd fixes

Initialize it in the places that used to set colour manually, and
add yet another tag.

Also, let unrands go without rnd, since they don't need it.

This should be the last...
Don't crash when looking at \ (johnstein)
Don't generate +144 rings
Remove some dead code.
Unionise monster::number.

While possibly most of these should be converted to props, number _is_
more efficient. This should also make it easier to change them to props
if that does seem like a better idea.
Unionise monster_info_base::number.
Fix compilation (gammafunk)
Sync manual from wiki (monster xv)
Don't crash when generating unrands