scheduler mappings: more descriptive rules names
scheduler mappings system_media rules: adjust cpu.shares (issue #2)
ulatency.match_flag(): include inherited flags if u_proc instance passed
simple.d/fixes.conf - tag buggy tumblerd with user.idle

tumblerd could be very disk I/O and CPU hungry for long time if
the processed file is being written (e.g. downloaded).
simple.d/sessions.conf - firefox:  do not inherit inactive_user.useless label

This can lead to the external downloader frozen (by freezer cgroup subsystem)
after switching to other user session.
tag gtk-gnash with inactive_user.useless label