… order The main consequence is that `P2Repository.findIU` now returns a *sorted* sequence of `InstallableUnit`, where the most recent one comes first. Furthermore, `P2Repository.findIU` now expect an exact `unitId` to be passed, and no longer works with regular expressions (the functionality was removed because it is not needed). Also, since we need to compare OSGI Version numbers, I've added a dependency to "org.osgi" % "org.osgi.core" % "4.3.0", as it provides a `Version` data object that implementes `Comparable`. This lead to a few changes so use `Version` instead of a raw string.
…ystem descriptor files