- don't fully extract in order to check .deb package consistency,
	only extract control information

- skip check completely if .dep file not already present
	(i.e. on the very first run, or in case it has been deleted)

check for broken package and show wget status

See merge request !1

# Conflicts:
#   zoom_local_repository.sh

- use long options for `wget` for better readibility
- always show `wget`'s progress bar, if downloading
- echo status messages before running `wget`"