Unable to delete ghost sibs
Write signatures in JupyterHub i.e. xx. Reload the ecore in pyrus and drag the SIB xx into canvas/pipeline. Go back again in Jhub and rename the SIB to yy. Come back to Pyrus, resync, refresh ecore. Now in ecore section the old SIB xx is replaces by sib yy and SIB yy is ready to use. Now problem is that the sib we use earlier xx is still in canvas and we are unable to delete that from pipeline