adding proper invalidation of hover/selection metadata in scatter_inspector, as well as some cleanup
adding proper invalidation of hover/selection metadata in scatter_inspector, as well as some cleanup

tommy-u/chaco,burnpanck/chaco,burnpanck/chaco,ContinuumIO/chaco,tommy-u/chaco,burnpanck/chaco,ContinuumIO/chaco,tommy-u/chaco,ContinuumIO/chaco,ContinuumIO/chaco