Harmonize tagpack-tool commands

[behas]

Currently, we have a bit of an uncontrolled growth of commands and arguments. I propose to re-structure the commands just as they are organized in modules:

tagpack-tool tagpack {validate, insert}
tagpack-tool taxonomy {list, show, insert}
tagpack-tool tagstore {init, update_cluster_mappings, refresh_views, remove_duplicates}
tagpack-tool quality {calculate, show}

Since quality scores are also a (simple) form of taxonomy, I also propose to integrate them into the taxonomy module.

The tagpack-tool tagstore init command could ingest all taxonomy files into the empty database.

[cybersec-code]

This is finally addressed in the pull request #62, which I think it's complete now