lava effects for monsters and objects

This patch, based on code sent to us by <Someone> well over a year ago, addresses
bugs recently resurfaced.  Namely, that lava does not generally do anything
to monsters or objects that land in java.  Newly renamed minliquid() handles
both water and lava, and new fire_damage() is used similar to water_damage().

src/apply.c

@@ -1016,6 +1016,32 @@ struct obj *obj;
 	return FALSE;
 }
 
+/* Called when potentially lightable object is affected by fire_damage().
+   Return TRUE if object was lit and FALSE otherwise --ALI */
+boolean
+catch_lit(obj)
+struct obj *obj;
+{
+	xchar x, y;
+
+	if (!obj->lamplit && (obj->otyp == CANDELABRUM_OF_INVOCATION ||
+		obj->otyp == WAX_CANDLE || obj->otyp == TALLOW_CANDLE ||
+		obj->otyp == OIL_LAMP || obj->otyp == MAGIC_LAMP ||
+		obj->otyp == BRASS_LANTERN || obj->otyp == POT_OIL)) {
+	    if (obj->otyp == MAGIC_LAMP && obj->spe == 0)
+		return FALSE;
+	    else if (obj->otyp != MAGIC_LAMP && obj->age == 0)
+		return FALSE;
+	    if (!get_obj_location(obj, &x, &y, 0))
+		return FALSE;
+	    if (obj->where == OBJ_MINVENT ? cansee(x,y) : !Blind)
+		pline("%s catches light!", Yname2(obj));
+	    begin_burn(obj, TRUE);
+	    return TRUE;
+	}
+	return FALSE;
+}
+
 STATIC_OVL void
 use_lamp(obj)
 struct obj *obj;