sound cleanup

+ Separate the two uses of flags.soundok.
+ Player-settable option is now called "acoustics".
+ Deafness is now handled as a full-fledged attribute.
+ Check for deafness in You_hear(), rather than caller.
+ Check for deafness in caller, rather than verbalize(),
  because gods can speak to characters in spite of deafness.
+ Since changes are being made to prop.h, reorder it to the
  same order as youprop.h and enlightenment.

There are still some extraneous checks and missing checks
for deafness, which will be followed up in a future patch.

Because of the size of this patch and its savefile incompatibilities,
it is only being applied to the trunk code.  Portions of this patch
were written by Michael Allison.

doc/Guidebook.mn

@@ -1620,6 +1620,9 @@ Customization options
 Here are explanations of what the various options do.
 Character strings that are too long may be truncated.
 Some of the options listed may be inactive in your dungeon.
+.lp acoustics
+Enable messages about what your character hears (default on).
+Note that this has nothing to do with your computer's audio capabilities.
 .lp align
 Your starting alignment (align:lawful, align:neutral,
 or align:chaotic).  You may specify just the first letter.
@@ -2033,11 +2036,6 @@ Show your approximate accumulated score on bottom line (default off).
 Suppress terminal beeps (default on).
 .lp sortpack
 Sort the pack contents by type when displaying inventory (default on).
-.lp sound
-Enable messages about what your character hears (default on).
-Note that this has nothing to do with your computer's audio capabilities.
-This option is only partly under player control.  The game toggles it
-off and on during and after sleep, for example.
 .lp sparkle
 Display a sparkly effect when a monster (including yourself) is hit by an
 attack to which it is resistant (default on).