removed passing of node weight and internal node indicator when passing

removed passing of node weight and internal node indicator when passing
  sample data from daemon to front-end;
cleaned up function names and implementation of daemon's sending the time
  it started to the front-end;
changed so initial actual value is sent in addition to the change in
  sampling value data, which allows actual value at any point to be
  reconstructed by integrating across change in sample value and adding
  initial actual value