Refactor ParameterizedItem's different naming schemes
|Status:||Rejected||Start date:||22 Dec 2015|
|Target version:||Sprint 30|
For the moment, ParameterizedItem has a property "Name", a QString modelType() and a QString displayName().
Since displayName() resolves ambiguities between children of the same type (by giving an extra index), this name should be displayed in the GUI (preferably using the property mechanism that automatically updates the corresponding views).
Is a user customized property "Name" still relevant or can we get rid of it?