added system profile example for optimizer
rpmkit.identrpm: cleanup the header
overhaul rpmkit.identrpm.parse_package_label (now has new name parse_rpm_label) to allow parsing of some more RPM label patterns
overhaul rpmkit.identrpm.complement_rpm_metada to list all candidates instead of just a head of list of candidates
add new function rpmkit.identrpm.identrpm to call parse_rpm_label and complement_rpm_metadata sequentially