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.

src/sit.c

@@ -202,6 +202,7 @@ dosit()
 			{
 			register int cnt = rnd(10);
 
+			/* Magical voice not affected by deafness */
 			pline("A voice echoes:");
 			verbalize("Thy audience hath been summoned, %s!",
 				  flags.female ? "Dame" : "Sire");
@@ -210,12 +211,14 @@ dosit()
 			break;
 			}
 		    case 8:
+			/* Magical voice not affected by deafness */
 			pline("A voice echoes:");
 			verbalize("By thy Imperious order, %s...",
 				  flags.female ? "Dame" : "Sire");
 			do_genocide(5);	/* REALLY|ONTHRONE, see do_genocide() */
 			break;
 		    case 9:
+			/* Magical voice not affected by deafness */
 			pline("A voice echoes:");
 	verbalize("A curse upon thee for sitting upon this most holy throne!");
 			if (Luck > 0)  {