Improve display of package:imports

Currently package:imports by default shows the import filter for imported packages. This is quit verbose though:
(&(osgi.wiring.package=org.osgi.util.tracker)(version>=1.0.0)(!(version>=2.0.0)))

There is an option -p to show only the package. This provides a much better overview but lacks the import ranges.

I propose to parse the filter and extract the package name as well as the import ranges. Then we can display the import like:
org.apache.aries.util.tracker | [1.0.0,2.0.0)

As this then contains all necessary informations I propose to make it the default view and remove the -p option. We can then have a new option --filter that will switch to the old default view.