Histograming/Sink/Utils.h: Truncate histogram name as required during printout

Christopher Rob Jonesrequested to merge
jonrob/Gaudi:truncate-histo-ID-with-ellipsis into master

Histograming/Sink/Utils.h: Truncate histogram name as required during printout with central ellipsis

See !1702 (comment 9135295)

FYI @sponce @rmatev

Edited by Christopher Rob Jones

Merge request reports