intrinsics revamp (trunk only)

Simplify many of the intrinsics macros from
  #define xxx_resistance (Hxxx || Exxx || resists_xxx(&youmonst))
down to
  #define xxx_resistance (Hxxx || Exxx)
by setting or clearing an extra bit in Hxxx during polymorph so that the
resists_xxx() check becomes implicit.

     Unfornately there were lots of places in the code that treat Hxxx
as a timeout number--primarily for Stunned, Confused, and Hallucination;
Stunned happens to be one of the revised macros--rather than as a bit
mask, so this patch needed a lot more changes than originally antipated.

src/read.c

@@ -900,7 +900,7 @@ struct obj *sobj; /* scroll, or fake spellbook object for scroll-like spell */
 			otmp->spe += -1;
 			adj_abon(otmp, -1);
 		    }
-		    make_stunned(HStun + rn1(10, 10), TRUE);
+		    make_stunned((HStun & TIMEOUT) + (long)rn1(10, 10), TRUE);
 		}
 	    }
 	    break;