METHODS
contextualize
Takes a context string (slash-separated list of keys) and returns a pair of hash-references: the ``top'' of the config (for merging) and the ``current pointer'' into the ``top'' hashref for where the new config entry should go.write_new_config
Merges the existing config file at "target_file" with the new entry and updates "target_file".take_action
Sets "field = value" at "context" in "target_file".

