Avoid cycles looking for dependent bundles.
Improve BundleUtils with strategy, avoiding cycles and applying lookup per layer.
Warn about not analyzable bundles.
Add BundleUtils integration tests.
Remove Activator. Obtain BundleContext from FrameworkUtil.
Improve BundleGuard creating ConcurrentBundleGuardData and other minor changes.
Solve minor BundleGuardTest bug.