use both recursive and upward recursive removal of dependencies/required_by (-r/-R)
cannot remove ./ in beginning of contents file
remove ./ in the beginning of lines in CONTENT
fixed typo
apk_glob is done
added db_zap_pkgv_meta added db_unregister_required_by
initial import
added apk_delete
rewritten for new generation apk-tools
modified example to something that really works