Audit rloc()

Most of the time, rloc() is used for teleporting monsters and it's not a
big deal if they can't find somewhere to go. In a few cases, it is. I
went through all the callsites and made calls to rloc() not cause
impossible()s if they don't need to.

Fixes a bug/suite of bugs reported by ais523.

src/muse.c

@@ -646,7 +646,7 @@ struct monst *mtmp;
         }
         if (oseen && how)
             makeknown(how);
-        (void) rloc(mtmp, FALSE);
+        (void) rloc(mtmp, TRUE);
         return 2;
     case MUSE_WAN_TELEPORTATION:
         zap_oseen = oseen;
@@ -1238,7 +1238,7 @@ register struct obj *otmp;
                 if (cansee(mtmp->mx, mtmp->my))
                     pline("%s resists the magic!", Monnam(mtmp));
             } else if (!tele_restrict(mtmp))
-                (void) rloc(mtmp, FALSE);
+                (void) rloc(mtmp, TRUE);
         }
         break;
     case WAN_CANCELLATION: