fixed  pair sorting in KDtree  id/distance  return
fixed  id  return in kdtree  pair return  function, needed to look up proper ID from kdtree itself and remap it on output
got  velocity advection in expansion library,  working  with fixed up kdtree funcs  no major jitter anymore  (was being caused by  kdtree errors)
added  advectionStrength and  velocity advection   controls to  partioVisualizer