bundle the display-related hints, that tell bot() and others

that an update is required, into a struct. Remove it from
context since there is no reason to save those.

src/objnam.c

@@ -4262,7 +4262,7 @@ readobjnam_postparse1(struct _readobjnam_data *d)
         d->otmp = mksobj(GOLD_PIECE, FALSE, FALSE);
         d->otmp->quan = (long) d->cnt;
         d->otmp->owt = weight(d->otmp);
-        gc.context.botl = 1;
+        display.botl = 1;
         return 3; /*return otmp;*/
     }