adapting for hawkey behaviour of latest filter option in Query
removed by_name function from queries.py
removed by_repo function from queries.py
removed installed_exact function from queries.py
removed by_file function from queries.py
removed latest_installed_per_arch function from queries.py
removed latest_available_per_arch function from queries.py
removed downgrades_by_name function from queries.py
removed updates_by_name function from queries.py