To include the device code in the undo system, we need functions to check for the existence of devices and to add or remove them. Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
To include the device code in the undo system, we need functions to check for the existence of devices and to add or remove them. Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>