We haven't added any new objects or monsters in a really long time.
This adds two new useful amulets, putting more pressure on the
decision over which type of amulet to wear.
amulet of flying: idea from slash'em, implemented from scratch.
Should be self-explanatory. Polymorphing into a form capable of
eating amulets and then eating one does not confer intrinsic
flight. (I've no idea how slash'em behaves is in that regard.)
amulet of guarding: adds +2 AC, which is fairly negligible, also
+2 MC, which is not. Initially called amulet of protection but MC
of 2 is referred to as 'guarded' by enlightenment so I changed it.
(By that reasoning, rings of protection ought to be called rings of
warding; oh, well.) Successfully eating one confers +2 AC without
any MC benefit. When wearing one of these, rings of protection
only confer AC, their +1 MC gets superseded rather than combined.
Monsters will wear an amulet of guarding and gain both the AC and
MC benefit, but if not cursed and they acquire one of life-saving or
reflection, they'll swap. They won't wear an amulet of flying.
I cloned two extra copies of the tile for one of the existing amulets
and ran sys/share/objects.txt through renumtiles.pl. The result
appears to be ok but on X11 the tiles map ends up looking psychedelic
so something beyond the tile art itself needs to be fixed here.
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