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/eat.c

@@ -1157,7 +1157,9 @@ no_opener:
 int
 Hear_again()		/* called when waking up after fainting */
 {
-	flags.soundok = 1;
+	/* Chance of deafness going away while fainted/sleepeing/etc. */
+	if (!rn2(2))
+	    set_itimeout(&HDeaf, 0L);
 	return 0;
 }
 
@@ -1177,6 +1179,8 @@ struct obj *obj;
 		if (!Blind) Your(vision_clears);
 	} else if(!rn2(3)) {
 		const char *what, *where;
+		int duration = rnd(10);
+
 		if (!Blind)
 		    what = "goes",  where = "dark";
 		else if (Levitation || Is_airlevel(&u.uz) ||
@@ -1189,8 +1193,8 @@ struct obj *obj;
 #endif
 			   surface(u.ux,u.uy);
 		pline_The("world spins and %s %s.", what, where);
-		flags.soundok = 0;
-		nomul(-rnd(10));
+		incr_itimeout(&HDeaf, duration);
+		nomul(-duration);
 		nomovemsg = "You are conscious again.";
 		afternmv = Hear_again;
 		return(1);
@@ -2211,7 +2215,7 @@ sync_hunger()
 
 	if(is_fainted()) {
 
-		flags.soundok = 0;
+		!Deaf = 0;
 		nomul(-10+(u.uhunger/10));
 		nomovemsg = "You regain consciousness.";
 		afternmv = unfaint;
@@ -2273,11 +2277,13 @@ boolean incr;
 		if(is_fainted()) newhs = FAINTED;
 		if(u.uhs <= WEAK || rn2(20-u.uhunger/10) >= 19) {
 			if(!is_fainted() && multi >= 0 /* %% */) {
+				int duration = 10-(u.uhunger/10);
+
 				/* stop what you're doing, then faint */
 				stop_occupation();
 				You("faint from lack of food.");
-				flags.soundok = 0;
-				nomul(-10+(u.uhunger/10));
+				incr_itimeout(&HDeaf, duration);
+				nomul(-duration);
 				nomovemsg = "You regain consciousness.";
 				afternmv = unfaint;
 				newhs = FAINTED;