vera: export XCURSOR_THEME environment variable.

This makes Openbox pick up the right cursor theme.
Also, a dummy cursor is now mapped to the root window, so applications
running *before* the WM can use a cursor.
DBusService: Lock support.

vera now listens for the Lock logind signal on the current Session (with
the new Session interface) and appropriately locks the screen via
xscreensaver-command.

Unlock is not supported (xscreensaver doesn't support it).
DBusService: fail if we are unable to acquire the bus.
ExitDialog: added hibernate ExitAction description.
ExitDialog: ensure the dialog is above everything.
ExitDialog and DBusService: show the confirmation dialog if in live mode.
User switching support.
0.32
Merge branch 'master' into debian
0.32-1
updated gitignore.
Merge branch 'master' into debian