client/model/core: add a special Node for use for debugging NaN problems
client/model/core: add a special Node for use for debugging NaN problems

yuvadm/rhizi,cben/rhizi,ozFri/rhizi,shlomif/rhizi,Rhizi/rhizi,tlevine/rhizi,shlomif/rhizi,ozFri/rhizi,yuvadm/rhizi,Rhizi/rhizi,Rhizi/rhizi,ozFri/rhizi,shlomif/rhizi,ozFri/rhizi,Rhizi/rhizi,cben/rhizi,shlomif/rhizi,cben/rhizi,tlevine/rhizi,tlevine/rhizi,cben/rhizi,yuvadm/rhizi,yuvadm/rhizi,tlevine/rhizi