Converter produces broken hull subpackages

The contentpackage to feature converter flattens out content packages but the empty subpackages being produced to satisfy the inner dependencies are currently invalid and miss out the jcr_root structure and also still have the old filters which might create trouble on wiping out content when being installed - to mitigate either the filters need to be adjusted or set to merge mode.

Suggestion:
build a default filter (root path) on mode merge with exclude on everything below (to avoid creation of huge snapshot packages when being manually installed) that would be reused for all hull packages) and add the missing jcr_content folder.