Creates a new Settings object with the relocatable schema specified by
and a given path.
You only need to do this if you want to directly create a settings object with a schema that doesn't have a specified path of its own. That's quite rare.
It is a programmer error to call this function for a schema that has an explicitly specified path.
It is a programmer error if
path is not a valid path. A valid path begins and ends with '/' and does not contain two consecutive
the id of the schema
the path to use
a new Settings object