Allow the recordings calendar to show how many days of recordings are available

[raspman]

It would be very helpful to have the recordings calendar show how many days of recordings are available (in a different color, such as blue.) A legend indicating which color represents what would also be helpful (e.g., red=xx, blue=x, etc.) While we should know what we set this to in the config file, it makes it easier to visually confirm which days video is available for, rather than having to click into a date and see if video is actually available or not.