Add two new items in module's dependency:
- recommends: a recommended module tells the sorting algo that if the module is found, it should be sorted accordingly. It is useful for optional dependencies, like shell or mission in some modules
- suggests: if a functionality is not provided by the user, a module can suggest a list of modules that can provide them. It is a convenient way to have "default" modules.
As a result the former autoload node is removed and replaced by suggested modules.