Add a yearly reservation overview page

[developeregrem]

It should be possible to switch between the current overview page and yearly one.
Currently the overview page is based on a given start page and a period (e.g. 30 days) and lists all availble apartments.
However, especially for single room properties this overview is not very usefull.
Therefore, an overview should be added to display a yearly overview based on a given year and a selected apartment.