Use everywhere (consistently) LHCbMath/Lomont.h
Removed from Gaudi with gaudi/Gaudi!398 (merged)
This includes cherry-picks of !861 (merged) and !866 (merged)
Edited by Marco Clemencic
Removed from Gaudi with gaudi/Gaudi!398 (merged)
This includes cherry-picks of !861 (merged) and !866 (merged)