#2 Enhance namespace detection

[Cedric Vidal]

Given a unit's namespace, if the last chunk of the namespace is contained in the identifier and the unit is alone in the namespace, then remove the last chunk of the namespace.

For example, given:

U1:
namespace: com.foo.bar.gui
identifier: foo-bar-gui

U2:
namespace: com.foo.bar.data
identifier: foo-bar-data

'gui' is contained in 'foo-bar-gui' and U1 is the only unit in namespace com.foo.bar.gui, so move foo-bar-gui to namespace com.foo.bar