21.9: Printouts cleanup
Cleaning up some spammy messages that are triggered very frequently by moving them to DEBUG.
In principle, it would also be good to do the same for the many
std::cout statements in GeoXMLUtils but since this doesn't inherit from AthAlg/AthAlgTool this is less straightforward, as it doesn't automatically know about the MsgSvc.
It looks like we anyway get e.g. this
15:46:04 XML: Could not find FrontEndChip chipGap in XML file
quite often in jobs where nothing appears to be wrong - are the messages really still needed?