[fix] in debug mode, only display aspects names, not Ruby objects
[fix] correct display attributes sorting
[fix] corrected display of unknown DN (closes #109)
[licence] copyright updated (or added when missing)
[fix] forgot to modify method call after moving away raw_item_info()
[evol] replace DNs with recognized objects in show command (if not in debug mode)
[cleanup] moved helper things out of LdapObject in Manipulation and began sweeping dust