Removing volume ID from simple services

This update removes the auto-generated ID number that was added to the names of the pixel simple service volumes.

The ID number was supposed to be set using the xml tag "FRAMENUM", but this has never been done, so a default value of zero was being returned and the PixelServicesTool generated an ID number based on the volume's index in the list. This is not a useful feature because changing the order of xml volume definitions, or inserting a new volume definition into the middle of the xml file, would cause every simple service volume to be renumbered and make it very difficult to compare against previous versions to see what had changed.

The only effect is on the names of the volumes, the actual volume properties (size, shape, mass, etc.) are unaffected.