allow to create a new segmentation for volume tracings by ignoring existing segmentation layers (#2033)
allow to create a new segmentation for volume tracings by ignoring existing segmentation layers (#2033)

scalableminds/webknossos,scalableminds/webknossos,scalableminds/webknossos,scalableminds/webknossos,scalableminds/webknossos,scalableminds/webknossos