-Add __version__.py.
-
-
-Configurable path to xsetbg.db.
-
-
-Remove absolute directory ~/lib to make it portable.
+Move xsetbg.conf to $XDG_CONFIG_HOME or $XDG_CONFIG_DIRS or $HOME/.config.
+Move xsetbg.db to $XDG_CACHE_HOME or $HOME/.cache.
Serialized list of images for faster starting.