When the module is loaded and the viewstep created, it doesn't have a
module Id **yet**. That is set after reading more of the configuration
file. It **is** set by the time setConfigurationMap() is called,
so pass it on to the Config object then. This means that packagechooser
modules can skip the *id* config key and use the module Id.
Rip out most of the ViewStep that deals with configuration,
move it to a Config object (not one that supports QML yet,
though), and massage the model a little.
