add code to set up the environment on Mac OS X based on kderc, this lets us inject things into PATH even if Finder doesn't know about them.

Also, add a workaround for setting up DBus based on the kde support scripts from <a href="http://ranger.users.finkproject.org/kde">http://ranger.users.finkproject.org/kde</a>;

-- this will go away when dbus has autolaunch support on osx.