okay so to summarize:
_DSME_ShutdownType stays, but everything else goes.
When the client sends SaveYourselfRequest, both fast and
interact-style are significant. They each specify whether the
session manager should follow user settings or be completely
uninteractive.
fast = False means display a ShutdownDialog if the user has
ShutdownDialog's configured to be shown.
fast = True means don't display a ShutdownDialog, the client has
already secified specifically how they want to
shutdown.
interact-style = Any means display
"Do you want to save document 'foo'?"
if the user has save confirm dialogs
configured to be shown on logout.
interact-style = Errors means display
"There was an error saving document
"'foo', do you want to cancel
shutdown?" if there is an error, but
otherwise don't display save-confirm
dialogs.