Pixelsilk API function to get the themes in the site
Pixelsilk API function to add a theme to a site
Pixelsilk API function to edit a theme's name
Pixelsilk API function to delete a theme
Pixelsilk API function to duplicate a theme
Pixelsilk API function to get the layout skin for the theme
Pixelsilk API function to save changes to any skins object
Pixelsilk API function to make a copy of the theme at the topmost group