#7 Existing hierarchy restrictions removed

[AlanP]

The existing dept->project->testsuite hierarchy should be
removed.
It should up to the user how they organise there testing.
A tree structure will be used to address this.
The tree will have multiple branches and leaves.
Elements should be able to moved around as easily as a file
explorer in a GUI.
This requires major changes EVERYWHERE (DB, app, UI),
but needs to be done.