whitespace SOCBuildingPanel, SOCHandPanel, misc i18n comment
SOCGame.placingItem: Clear in updateAtTurn, placePort; +getPlacingItem, setPlacingItem, javadocs
SOCInventoryItem +isPlayForPlacement, javadocs
SOCSimpleRequest(TRADE_PORT_PLACE): javadoc client handling
SOCInventoryItemAction +PLACING_EXTRA to send game.placingItem to clients; javadocs message handling
SOCHandPanel state PLACING_INV_ITEM: Check game.placingItem.canCancelPlay
SOCGameHandler: _SC_FTRI send SOCInventoryItemAction(PLACING_EXTRA) if immediate port placement; SOCCancelBuildRequest(INV_ITEM_PLACE_CANCEL) send changed game state, even if null placingItem