deal with multiple occurrences of a single package in dependencies
sort import package instructions

...so correct handling is assured. If the packages were not sorted (longer names
coming first) due to the wild cards wrong versions could be applied.
ignore certain packages seemingly provided by Jars
added new platformaux configuration

platformaux ensures that the dependencies added there are added as additional bundles
to the platform. It allows adding multiple versions of the same dependency, but it
(at least currently) ignores transitive dependencies.