Add dbus skip/postpone event, and function to get current stage

Signed-off-by: Rob Caelers <rob.caelers@gmail.com>
Avoid that both X11 and GenericDbus applet are visible.

Signed-off-by: Rob Caelers <rob.caelers@gmail.com>
Add header files to dist tarball.

Signed-off-by: Rob Caelers <rob.caelers@gmail.com>
Update NEWS with cinnamon/xrce applet.

Signed-off-by: Rob Caelers <rob.caelers@gmail.com>