1.6.0-build-2

• Generalize handling of ^
• Add a clause to digging to mention weapon/digger
• Replace suicide with retire
• Windows client SDL_mixer
• SDL2 update
• Fix sounds amb_bell_metal
• Highlight players '@' on mini map
• Don't restrict use of stairs for Dungeon Master
• Implement MORE_TOWNS as a dungeon flag
• Properly show level coordinates on tombstone/retirement screen if negative
• Fix moronic bug in stair generation
• When appending spells to monster lore, set ref_race for expressions
• Don't suppress vulnerabilities in artifact creation
• For instant artifact kinds, inherit the flags and element info of the tval
• Check unshifted shape rather than current shape when testing for Banish
• SDL: avoid discarded const warning
• Remove keys-gcu.prf