gnome-screensaver support in ROX-Session

I noticed that gnome-screensaver 0.26 only works with gnome-session
which is a nuisance, because gnome-power-manager relies on
gnome-screensaver and gnome-power-manager is very useful on laptops.

I've ripped out the bits of gnome-session which activate
gnome-screensaver and added them to ROX-Session. Actually to a child
process called ROXIdleMonitor to reduce bloat in the core of ROX-Session
for people who don't use gnome-screensaver.

There are new versions of ROX-Session and the Screensaver configlet in
subversion (see the SF project page for details), I'd appreciate it if
somebody could give them a try before I release new tarballs.

NB ROX-Session automatically starts gnome-screensaver if the option is
set, but you should start gnome-power-manager by other means, eg
XDGStart.

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