Qt Creator project tree adds erroneous nodes

Every node that is created as a result of a Group's name property also contains a node for the QBS file containing it. This results in a single QBS file potentially being added to the project tree many times. Each QBS file should only appear once in the entire tree.

Also, all file nodes appear to be contained by a node containing the full path to the folder containing those files. This node should not exist; the files should be contained directly by the folder node representing their Group, or, if they are not in a group, the folder node representing their Product.

Files that are not in a group also get put inside a folder node with the same name as the product which is already contained in the node representing the Product. Eliminate the extra level of indirection (it's conceptually inaccurate anyways).

This is easier to show graphically, see the attached screenshot. Based on it, I would expect to have seen:

• silvercore (the project node, this is cropped out of the screenshot)
  • silvercore.qbs
  • Cryptography
    • AbstractCryptographyEngine.cpp
    • AbstractCryptographyEngine.h
    • ...
    • KeyGenerator.h
  • Cryptography Engines
  • ...
  • Objective-C API