fix bug where aggComponents weren't getting properly initialized - - - -

fix bug where aggComponents weren't getting properly initialized  - - - -
mark each metricDefinitionNode of the mdn graph that gets built up for a
metric if it has aggComponents that need to have their start time or
initial actual value initialized; check whether top level mdn's have any
children mdn's with aggComponents that need to be initialized when a
process continues; fix updateWithDeltaValue to handle unusual MT mdn graph