adding the MonitoringRelay component

adding the MonitoringRelay component
The MonitoringRelay can be used together with components producing histograms and publishing those
just for a scaled down number of events. The relay keeps a copy of the binary data block for every
new TObject, though objects are unpacked in order to extract name and title. The component publishes
the binary blocks for every event, the time consuming streaming however is avoided.
First version, needs to be fully tested.