Module persistence

Obtain a directory suitable for storing a persistent file.

Accepts an optional directory name. If directory is an absolute path, it will be treated as such. Otherwise, it will be treated as a path relative to a writeable directory (on *nix, it's the current user's home directory. On Windows, it's the roaming profile Application Data directory).

If the resulting absolute path refers to a directory that does not exist, it will be created.

Open and parse a config file filename in an optional given directory directory.

directory will be passed through storage_dir, so it may be a path relative to the user's home directory. If left blank, therefore, it will be the user's home directory itself.

Create or load a pickled dictionary from filename in optional directory.

directory will be passed through storage_dir, so it may be a path relative to the user's home directory.