Use directly GdkEventButton in a callback
proctable: make sure there is only one timeout running
GsmTreeView: automatically hide excluded columns
proctable: if SELinux is absent exclude relative column

Use GsmTreeView API instead of doing that manually.
make_loadavg_string() is private to proctable
Throttle saving of column state

Instead of continuously updating the gsettings key, save it
only after resizing is pause for 250msecs.

https://bugzilla.gnome.org/show_bug.cgi?id=685946
Merge remote-tracking branch 'origin' into wip/newdesign
Minor improvements to the color button label
Network color pickers ported to new design, without bits display yet