created consistent metric update value functions;

created consistent metric update value functions;
reorganized in internal metrics
changed aggregation classes and implementation and updated clients to use
  new aggregation code;
first step in removal of metric style field;
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;