comps: Environment differentiates optional and mandatory groups
logging: renamed log files (RhBug:1074715)"
output: renamed displayPkgsInGroups
logging: added logrotate script for hawkey.log (RhBug:1149350)
fix: traceback in history info <name> (RhBug: 1149952)

Set |= need 2 sets, update take any iterable
groups: searches also within localized names (RhBug:1150474)