* thunar/thunar-gdk-extensions.{c,h}: Add new helper function 
	  thunar_gdk_screen_get_active(), which returns the currently
	  active screen, i.e. the screen which currently contains the
	  mouse pointer.
	* thunar-vfs/thunar-vfs-volume-hal.c: Use the new ExoMountPoint
	  module to query active and configured mount points.
	* thunar-vfs/thunar-vfs-volume-hal.c: Add new signals "device-added"
	  and "device-removed", which correspond to the HAL signals of the
	  same name, and are emitted by the volume manager whenever a new
	  device is added or an existing device is removed. This is an
	  internal support mechanism for the volume manager integration of
	  Thunar and should not be used by other applications.
	* thunar/thunar-application.c: Add hooks for the thunar-volman,
	  which, if installed and enabled, will be spawned whenever a new
	  device is reported by HAL. This enables lightweight volume management
	  avoiding an additional daemon, as Thunar already listens for HAL
	  events anyway. Note that Thunar doesn't provide any functionality
	  by itself here. It just acts a proxy between HAL and thunar-volman.
	* docs/README.thunarrc, thunar/thunar-preferences.c: Add preference
	  MiscVolumeManagement, which controls whether volume manager should
	  be enabled.
	* docs/references/thunar-vfs/: Add missing enums to the manual.
	* thunar/thunar-preferences-dialog.c, thunar/sexy-url-label.{c,h},
	  thunar/Makefile.am: Extend the preferences dialog with options
	  to control the volume manager.
	* po/Thunar.pot, po/*.po: Merge new strings.
	* po/de.po: Update german translations.




(Old svn revision: 24348)