Changes

* Sell Priority - show the rooms as per the rooms sell priority setting.* Unavailable at bottom - show available rooms by sell priority and unavailable rooms at the bottom.* Cheapest First - show available rooms by increasing or price order and unavailable rooms at the bottom.* Expensive First - show available rooms by decreasing price order and unavailable rooms at the bottom.* Hide Unavailable - show available rooms by sell priority and hide unavailable rooms.  Note: sorting does not work across pagination, if using pagination to limit the number of rooms shown, the pages will be constructed using rooms with the highest sell priority on the first page through to the lowest sell priority on the last page. The sort order will apply per page.