Allow crystal ball to search for furniture (stairs and ladders,
altar, throne, sink, fountain) as well as for a class or objects
or of monsters or all traps. Giving any of '<','>','_','\','#',
or '{' will find all of those rather than just the individual type
specified. Because of the default character conflict, '_' can no
longer be used to find chains; looking for altars is more useful.
The chance of getting the cursed effect due to failing a saving
throw against intelligence when the ball isn't actually cursed has
been reduced. If it is the hero's own quest artifact, it will
happen if rnd(8) is greater than Int, so Int of 8 or more will
never yield that effect. Otherwise if it is blessed, rnd(16) is
used so 16 or better Int means it can't act like it is cursed.
When uncursed and not hero's quest artifact, the old rnd(20) > Int
test is still used.
Crystal balls now start with 3..7 charges rather than 1..5, and
blessed charging sets the amount to 7 charges rather than 6 and
also blesses the ball. Recharing with uncursed scroll of charging
is slightly better (adds 1..2 charges instead of always just 1,
caps the amount at 7 rather than 5) and uncurses the ball. Cursed
scroll strips off all charges even if the ball is blessed and also
curses the ball so is harsher than before.
Crystal balls now cancel to -1 instead of 0, like wands, and using
one effect will destroy it, like zapping cancelled wands.
Also a minor tweak to the initial charges for can of grease (5..25
instead of 1..25) and horn of plenty and bag of tricks (both now
3..20 instead of 1..20).
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