cham changes (trunk only)

This is a foundation patch for patches to follow.
- use a full short index for mon->cham field.
- The current system of providing CHAM_XXX values
  was limited to the 3 bits allocated in the bitfield and invalidated
  save/bones if the field was expanded.
- The current system didn't provide an easy backwards  change
  if multiple monster types wanted to use the bit, there was a one
  to one mapping:  For instance, if you wanted a CHAM_VAMPIRE,
  and you wanted vampires, vampire lords, and Vlad to use it, you
  would have to have CHAM_VAMPIRE, CHAM_VAMPIRE_LORD,
  and CHAM_VLAD defined to achieve that with the one-to-one backward
  mapping.
- This new way just uses the mon[] index in the mon->cham field and
  eliminates the need for CHAM_XXX  (CHAM_ORDINARY is still used).
- no longer requires the cham_to_pm mappings

src/pline.c

@@ -309,7 +309,7 @@ register struct monst *mtmp;
 	}
 	else if (mtmp->mpeaceful) Strcat(info, ", peaceful");
 	if (mtmp->meating)	  Strcat(info, ", eating");
-	if (mtmp->meating && !mtmp->cham &&
+	if (mtmp->meating && (mtmp->cham == CHAM_ORDINARY) &&
 	    mtmp->mappearance && mtmp->m_ap_type) {
 	    	Sprintf(eos(info), ", mimicing %s",
 		    (mtmp->m_ap_type == M_AP_FURNITURE) ?